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Windows Analysis Report PROFORMA INVOICE.xlsx
Overview
General Information
| Sample Name: | PROFORMA INVOICE.xlsx |
| Analysis ID: | 528789 |
| MD5: | f0e46aba95165b11ad7fc84d80a73730 |
| SHA1: | 2ea511219e2c3d76597483c4998a2af40d821142 |
| SHA256: | 009dfe9d9409704671b802ddaa54ee22355f3ff41c6ef779b7e644c76466e0b0 |
| Tags: | VelvetSweatshopxlsx |
| Infos: | |
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Detection
FormBook
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Sigma detected: EQNEDT32.EXE connecting to internet
Yara detected AntiVM3
System process connects to network (likely due to code injection or exploit)
Antivirus detection for URL or domain
Sigma detected: Suspect Svchost Activity
Found malware configuration
Multi AV Scanner detection for submitted file
Yara detected FormBook
Malicious sample detected (through community Yara rule)
Sigma detected: Droppers Exploiting CVE-2017-11882
Sigma detected: File Dropped By EQNEDT32EXE
Maps a DLL or memory area into another process
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
.NET source code contains potential unpacker
Injects a PE file into a foreign processes
Sigma detected: Execution from Suspicious Folder
Sigma detected: Suspicious Svchost Process
Office equation editor drops PE file
Tries to detect virtualization through RDTSC time measurements
Adds a directory exclusion to Windows Defender
Uses schtasks.exe or at.exe to add and modify task schedules
Sample uses process hollowing technique
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Sigma detected: Suspicius Add Task From User AppData Temp
Sigma detected: Powershell Defender Exclusion
Queues an APC in another process (thread injection)
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
Antivirus or Machine Learning detection for unpacked file
May sleep (evasive loops) to hinder dynamic analysis
Uses code obfuscation techniques (call, push, ret)
Detected potential crypto function
Sample execution stops while process was sleeping (likely an evasion)
HTTP GET or POST without a user agent
Downloads executable code via HTTP
Contains long sleeps (>= 3 min)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Potential document exploit detected (unknown TCP traffic)
Drops PE files
Contains functionality to read the PEB
Uses a known web browser user agent for HTTP communication
Checks if the current process is being debugged
Drops PE files to the user directory
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)
Queries the volume information (name, serial number etc) of a device
Yara signature match
Internet Provider seen in connection with other malware
Found potential string decryption / allocating functions
Contains functionality to call native functions
Potential document exploit detected (performs DNS queries)
IP address seen in connection with other malware
Contains functionality for execution timing, often used to detect debuggers
Enables debug privileges
Found inlined nop instructions (likely shell or obfuscated code)
Office Equation Editor has been started
Potential document exploit detected (performs HTTP gets)
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Classification
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| Antivirus detection for URL or domain |
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| Found malware configuration |
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| Multi AV Scanner detection for submitted file |
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| Yara detected FormBook |
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| Antivirus or Machine Learning detection for unpacked file |
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| Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) |
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| Office Equation Editor has been started |
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Software Vulnerabilities: |
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| Potential document exploit detected (unknown TCP traffic) |
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| Potential document exploit detected (performs DNS queries) |
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| Found inlined nop instructions (likely shell or obfuscated code) |
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Code function: |
9_2_00406ABE | |
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12_2_00086ABE | |
| Potential document exploit detected (performs HTTP gets) |
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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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| C2 URLs / IPs found in malware configuration |
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| HTTP GET or POST without a user agent |
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| Downloads executable code via HTTP |
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