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Windows Analysis Report Remittance_Advice_details001009142021.xlsx
Overview
General Information
| Sample Name: | Remittance_Advice_details001009142021.xlsx |
| Analysis ID: | 483680 |
| MD5: | 849137c07d96b63b89b0fe9fc240751e |
| SHA1: | 21f9985416c2bfc51a88615f5806916fa1165502 |
| SHA256: | 594eeeb07a9f81d9a2e3718fb25ca290ca86a45990a9ca89799dcbdcf114779c |
| Tags: | VelvetSweatshopxlsx |
| Infos: | |
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Most interesting Screenshot:  |
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Detection
FormBook
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Found malware configuration
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Sigma detected: EQNEDT32.EXE connecting to internet
Multi AV Scanner detection for submitted file
Yara detected FormBook
Malicious sample detected (through community Yara rule)
Sigma detected: Droppers Exploiting CVE-2017-11882
System process connects to network (likely due to code injection or exploit)
Sigma detected: File Dropped By EQNEDT32EXE
Antivirus detection for URL or domain
Multi AV Scanner detection for dropped file
Sample uses process hollowing technique
Maps a DLL or memory area into another process
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Sigma detected: Execution from Suspicious Folder
Office equation editor drops PE file
Queues an APC in another process (thread injection)
Tries to detect virtualization through RDTSC time measurements
Machine Learning detection for dropped file
Modifies the context of a thread in another process (thread injection)
C2 URLs / IPs found in malware configuration
Drops PE files to the user root directory
Yara signature match
Antivirus or Machine Learning detection for unpacked file
Contains functionality to check if a debugger is running (IsDebuggerPresent)
May sleep (evasive loops) to hinder dynamic analysis
Uses code obfuscation techniques (call, push, ret)
Internet Provider seen in connection with other malware
Detected potential crypto function
Contains functionality to query CPU information (cpuid)
Found potential string decryption / allocating functions
Sample execution stops while process was sleeping (likely an evasion)
Contains functionality to check if a debugger is running (OutputDebugString,GetLastError)
Contains functionality to call native functions
Potential document exploit detected (performs DNS queries)
HTTP GET or POST without a user agent
Contains functionality which may be used to detect a debugger (GetProcessHeap)
IP address seen in connection with other malware
Downloads executable code via HTTP
Contains functionality for execution timing, often used to detect debuggers
Enables debug privileges
Found inlined nop instructions (likely shell or obfuscated code)
Potential document exploit detected (unknown TCP traffic)
Extensive use of GetProcAddress (often used to hide API calls)
Drops PE files
Contains functionality to read the PEB
Uses a known web browser user agent for HTTP communication
Office Equation Editor has been started
Checks if the current process is being debugged
Drops PE files to the user directory
Potential document exploit detected (performs HTTP gets)
Allocates memory within range which is reserved for system DLLs (kernel32.dll, advapi32.dll, etc)
Creates a process in suspended mode (likely to inject code)
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Classification
AV Detection: |
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| Found malware configuration |
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Malware Configuration Extractor: |
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| Multi AV Scanner detection for submitted file |
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ReversingLabs: |
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| Yara detected FormBook |
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| Antivirus detection for URL or domain |
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| Multi AV Scanner detection for dropped file |
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ReversingLabs: |
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| Machine Learning detection for dropped file |
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Joe Sandbox ML: |
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| Antivirus or Machine Learning detection for unpacked file |
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Exploits: |
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| Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) |
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Process created: |
Jump to behavior | ||
| Office Equation Editor has been started |
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Process created: |
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File opened: |
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Software Vulnerabilities: |
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| Potential document exploit detected (performs DNS queries) |
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DNS query: |
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| Found inlined nop instructions (likely shell or obfuscated code) |
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Code function: |
8_2_00415852 | |
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Code function: |
8_2_00406A98 | |
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Code function: |
8_2_00415699 | |
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Code function: |
11_2_000F5699 | |
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Code function: |
11_2_000F5852 | |
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Code function: |
11_2_000E6A99 | |
| Potential document exploit detected (unknown TCP traffic) |
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TCP traffic: |
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| Potential document exploit detected (performs HTTP gets) |
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Memory has grown: |
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Networking: |
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| Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) |
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| System process connects to network (likely due to code injection or exploit) |
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Network Connect: |
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Domain query: |
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Network Connect: |
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Network Connect: |
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Domain query: |
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Domain query: |
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| C2 URLs / IPs found in malware configuration |
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| Internet Provider seen in connection with other malware |
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| HTTP GET or POST without a user agent |
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HTTP traffic detected: |
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| IP address seen in connection with other malware |
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| Downloads executable code via HTTP |
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