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Windows
Analysis Report
W6902.xlsx
Overview
General Information
| Sample Name: | W6902.xlsx |
| Analysis ID: | 562479 |
| MD5: | 9a0e6f87707210a385ef8ed3bf348de3 |
| SHA1: | 800a9f004b17cd24413eb98c2f6d9fcd02128887 |
| SHA256: | 41b58cddca86e32e7034daf8e97dcdaa04ac6cdcb41eae86be1c3fa7fd05c871 |
| Tags: | FormbookVelvetSweatshopxlsx |
| Infos: |   |
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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
Yara detected FormBook
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: 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)
Injects a PE file into a foreign processes
Found evasive API chain (may stop execution after reading information in the PEB, e.g. number of processors)
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
May sleep (evasive loops) to hinder dynamic analysis
Contains functionality to shutdown / reboot the system
Uses code obfuscation techniques (call, push, ret)
Internet Provider seen in connection with other malware
Detected potential crypto function
Found potential string decryption / allocating functions
Sample execution stops while process was sleeping (likely an evasion)
Contains functionality to call native functions
Contains functionality to dynamically determine API calls
Potential document exploit detected (performs DNS queries)
HTTP GET or POST without a user agent
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)
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
Dropped file seen in connection with other malware
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)
Contains functionality for read data from the clipboard
Classification
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Code function: |
4_2_00405D7C | |
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4_2_004053AA | |
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