Analysis Report document-1421190491.xls

Overview

General Information

Sample Name: document-1421190491.xls
Analysis ID: 324308
MD5: 6fb9d4467b35d90aaa988395194590c7
SHA1: e8506016f9fead7cda2181110732282805284a97
SHA256: d6237352c99d9956dd3857cadcad11a382a471c8b73962e2f784728e8aba5cdd
Tags: goziSilentBuilderursnifxls

Most interesting Screenshot:

Detection

Hidden Macro 4.0
Score: 72
Range: 0 - 100
Whitelisted: false
Confidence: 100%

Signatures

Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Document exploit detected (UrlDownloadToFile)
Document exploit detected (process start blacklist hit)
Found Excel 4.0 Macro with suspicious formulas
Found obfuscated Excel 4.0 Macro
Sigma detected: Microsoft Office Product Spawning Windows Shell
Yara detected hidden Macro 4.0 in Excel
Allocates a big amount of memory (probably used for heap spraying)
Document contains embedded VBA macros
IP address seen in connection with other malware
Potential document exploit detected (performs DNS queries)
Potential document exploit detected (performs HTTP gets)
Potential document exploit detected (unknown TCP traffic)
Registers a DLL
Uses a known web browser user agent for HTTP communication
Yara signature match

Classification

Software Vulnerabilities:

barindex
Document exploit detected (UrlDownloadToFile)
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Section loaded: \KnownDlls\api-ms-win-downlevel-shlwapi-l2-1-0.dll origin: URLDownloadToFileA Jump to behavior
Document exploit detected (process start blacklist hit)
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process created: C:\Windows\System32\regsvr32.exe Jump to behavior
Allocates a big amount of memory (probably used for heap spraying)
Source: excel.exe Memory has grown: Private usage: 4MB later: 51MB
Potential document exploit detected (performs DNS queries)
Source: global traffic DNS query: name: me48.ru
Potential document exploit detected (performs HTTP gets)
Source: global traffic TCP traffic: 192.168.2.22:49165 -> 188.225.24.87:80
Potential document exploit detected (unknown TCP traffic)
Source: global traffic TCP traffic: 192.168.2.22:49165 -> 188.225.24.87:80

Networking:

barindex
IP address seen in connection with other malware
Source: Joe Sandbox View IP Address: 188.225.24.87 188.225.24.87
Uses a known web browser user agent for HTTP communication
Source: global traffic HTTP traffic detected: GET /ds/231120.gif HTTP/1.1Accept: */*UA-CPU: AMD64Accept-Encoding: gzip, deflateUser-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Win64; x64; Trident/7.0; .NET CLR 2.0.50727; SLCC2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)Host: me48.ruConnection: Keep-Alive
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE File created: C:\Users\user\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\T4O403JZ Jump to behavior
Source: global traffic HTTP traffic detected: GET /ds/231120.gif HTTP/1.1Accept: */*UA-CPU: AMD64Accept-Encoding: gzip, deflateUser-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Win64; x64; Trident/7.0; .NET CLR 2.0.50727; SLCC2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)Host: me48.ruConnection: Keep-Alive
Source: unknown DNS traffic detected: queries for: me48.ru
Source: document-1421190491.xls String found in binary or memory: http://me48.ru/ds/231120.gif
Source: regsvr32.exe, 00000003.00000002.2093279170.0000000001D80000.00000002.00000001.sdmp String found in binary or memory: http://servername/isapibackend.dll

System Summary:

barindex
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Source: Screenshot number: 4 Screenshot OCR: Enable editing" to unlock the editing document downloaded from the internet.y 0Protected View This
Source: Screenshot number: 4 Screenshot OCR: Enable content" to perform Microsoft Word Decryption Core to start the decryption of the document.
Source: Screenshot number: 8 Screenshot OCR: Enable Content X I J15 " "," jR " A B C D E F G H I K L M N O P Q R S T Y 301 302 303 304
Found Excel 4.0 Macro with suspicious formulas
Source: document-1421190491.xls Initial sample: CALL
Source: document-1421190491.xls Initial sample: CALL
Source: document-1421190491.xls Initial sample: CALL
Source: document-1421190491.xls Initial sample: CALL
Source: document-1421190491.xls Initial sample: EXEC
Found obfuscated Excel 4.0 Macro
Source: document-1421190491.xls Initial sample: High usage of CHAR() function: 18
Document contains embedded VBA macros
Source: document-1421190491.xls OLE indicator, VBA macros: true
Yara signature match
Source: document-1421190491.xls, type: SAMPLE Matched rule: SUSP_Excel4Macro_AutoOpen date = 2020-03-26, author = John Lambert @JohnLaTwC, description = Detects Excel4 macro use with auto open / close, score = 2fb198f6ad33d0f26fb94a1aa159fef7296e0421da68887b8f2548bbd227e58f
Source: classification engine Classification label: mal72.expl.evad.winXLS@3/5@1/1
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE File created: C:\Users\user\Desktop\C9DE0000 Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE File created: C:\Users\user\AppData\Local\Temp\CVRD0C6.tmp Jump to behavior
Source: document-1421190491.xls OLE indicator, Workbook stream: true
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE File read: C:\Users\desktop.ini Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Key opened: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers Jump to behavior
Source: unknown Process created: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE 'C:\Program Files\Microsoft Office\Office14\EXCEL.EXE' /automation -Embedding
Source: unknown Process created: C:\Windows\System32\regsvr32.exe regsvr32 -s C:\giogti\mpomqr\fwpxeohi.dll
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process created: C:\Windows\System32\regsvr32.exe regsvr32 -s C:\giogti\mpomqr\fwpxeohi.dll Jump to behavior
Source: Window Recorder Window detected: More than 3 window changes detected
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Key opened: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Excel\Resiliency\StartupItems Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE File opened: C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.30729.4940_none_08e4299fa83d7e3c\MSVCR90.dll Jump to behavior

Data Obfuscation:

barindex
Registers a DLL
Source: unknown Process created: C:\Windows\System32\regsvr32.exe regsvr32 -s C:\giogti\mpomqr\fwpxeohi.dll
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE Process information set: NOOPENFILEERRORBOX Jump to behavior

HIPS / PFW / Operating System Protection Evasion:

barindex
Yara detected hidden Macro 4.0 in Excel
Source: Yara match File source: document-1421190491.xls, type: SAMPLE
windows-stand
Hide Legend

Legend:

  • Process
  • Signature
  • Created File
  • DNS/IP Info
  • Is Dropped
  • Is Windows Process
  • Number of created Registry Values
  • Number of created Files
  • Visual Basic
  • Delphi
  • Java
  • .Net C# or VB.NET
  • C, C++ or other language
  • Is malicious
  • Internet
behaviorgraph top1 signatures2 2 Behavior Graph ID: 324308 Sample: document-1421190491.xls Startdate: 29/11/2020 Architecture: WINDOWS Score: 72 14 Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros) 2->14 16 Sigma detected: Microsoft Office Product Spawning Windows Shell 2->16 18 Found obfuscated Excel 4.0 Macro 2->18 20 2 other signatures 2->20 6 EXCEL.EXE 87 42 2->6         started        process3 dnsIp4 12 me48.ru 188.225.24.87, 49165, 80 TIMEWEB-ASRU Russian Federation 6->12 22 Document exploit detected (process start blacklist hit) 6->22 24 Document exploit detected (UrlDownloadToFile) 6->24 10 regsvr32.exe 6->10         started        signatures5 process6
  • No. of IPs < 25%
  • 25% < No. of IPs < 50%
  • 50% < No. of IPs < 75%
  • 75% < No. of IPs

Contacted Public IPs

IP Domain Country Flag ASN ASN Name Malicious
188.225.24.87
 unknown Russian Federation
9123 TIMEWEB-ASRU false

Contacted Domains

Name IP Active
me48.ru 188.225.24.87 true

Contacted URLs

Name Malicious Antivirus Detection Reputation
http://me48.ru/ds/231120.gif false
  • URL Reputation: safe
  • URL Reputation: safe
  • URL Reputation: safe
 unknown