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Analysis Report spetsifikatsiya.xls

Overview

General Information

Sample Name:spetsifikatsiya.xls
Analysis ID:336052
MD5:bf9774e5063791aba95abb5b808aea43
SHA1:2774db354121fd9080d86623e8e854af967b14cf
SHA256:bcac1e33956458b61bbc185ad3861e385f863ec9bb9232e67eea95282929ce30
Tags:SilentBuilderxls

Most interesting Screenshot:

Detection

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

Signatures

Malicious sample detected (through community Yara rule)
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Sigma detected: Scheduled temp file as task from temp location
Yara detected AntiVM_3
Contains functionality to hide a thread from the debugger
Document exploit detected (process start blacklist hit)
Found Excel 4.0 Macro with suspicious formulas
Found obfuscated Excel 4.0 Macro
Hides threads from debuggers
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Obfuscated command line found
Powershell drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
Suspicious powershell command line found
Tries to download and execute files (via powershell)
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected Obfuscated Powershell
AV process strings found (often used to terminate AV products)
Abnormal high CPU Usage
Allocates memory within range which is reserved for system DLLs (kernel32.dll, advapi32.dll, etc)
Contains functionality to call native functions
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to communicate with device drivers
Contains functionality to dynamically determine API calls
Contains functionality to query CPU information (cpuid)
Contains functionality to query locales information (e.g. system language)
Contains functionality to read the PEB
Contains functionality which may be used to detect a debugger (GetProcessHeap)
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Detected TCP or UDP traffic on non-standard ports
Detected potential crypto function
Document contains embedded VBA macros
Downloads executable code via HTTP
Drops PE files
Enables debug privileges
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found potential string decryption / allocating functions
HTTP GET or POST without a user agent
IP address seen in connection with other malware
Installs a global mouse hook
Internet Provider seen in connection with other malware
JA3 SSL client fingerprint seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
Potential document exploit detected (performs DNS queries)
Potential document exploit detected (performs HTTP gets)
Potential document exploit detected (unknown TCP traffic)
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Searches for user specific document files
Sleep loop found (likely to delay execution)
Tries to load missing DLLs
Uses code obfuscation techniques (call, push, ret)
Yara signature match

Classification