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Windows Analysis Report MTIR22024323_0553381487_20220112120005.vbs
Overview
General Information
| Sample Name: | MTIR22024323_0553381487_20220112120005.vbs |
| Analysis ID: | 552589 |
| MD5: | 564601676bee71f5f61a44ef170d92a6 |
| SHA1: | 76fca984dab2358e66524172e04a3528f33d8e18 |
| SHA256: | 5e12314df61fd39cad151a41fb0d3188e437c591fa7498f09f103dea4a46f141 |
| Tags: | vbs |
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Detection
FormBook GuLoader
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Found malware configuration
Detected FormBook malware
Multi AV Scanner detection for submitted file
Yara detected FormBook
Malicious sample detected (through community Yara rule)
VBScript performs obfuscated calls to suspicious functions
Yara detected GuLoader
Hides threads from debuggers
Sample uses process hollowing technique
Tries to steal Mail credentials (via file / registry access)
Maps a DLL or memory area into another process
Tries to detect Any.run
Wscript starts Powershell (via cmd or directly)
Potential malicious VBS script found (suspicious strings)
Potential malicious VBS script found (has network functionality)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Encrypted powershell cmdline option found
Very long command line found
Queues an APC in another process (thread injection)
Tries to detect virtualization through RDTSC time measurements
Sigma detected: CMSTP Execution Process Creation
Modifies the context of a thread in another process (thread injection)
C2 URLs / IPs found in malware configuration
Tries to harvest and steal browser information (history, passwords, etc)
Uses a Windows Living Off The Land Binaries (LOL bins)
Queries the volume information (name, serial number etc) of a device
Yara signature match
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
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
Found potential string decryption / allocating functions
Sample execution stops while process was sleeping (likely an evasion)
JA3 SSL client fingerprint seen in connection with other malware
Contains functionality to call native functions
Found dropped PE file which has not been started or loaded
Contains functionality for execution timing, often used to detect debuggers
Contains long sleeps (>= 3 min)
Enables debug privileges
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Java / VBScript file with very long strings (likely obfuscated code)
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
Contains capabilities to detect virtual machines
Sigma detected: Suspicious Csc.exe Source File Folder
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
Compiles C# or VB.Net code
Sigma detected: Suspicious Execution of Powershell with Base64
Found large amount of non-executed APIs
Creates a process in suspended mode (likely to inject code)
Found WSH timer for Javascript or VBS script (likely evasive script)
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Classification
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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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| Potential malicious VBS script found (has network functionality) |
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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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| JA3 SSL client fingerprint seen in connection with other malware |
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| Uses a known web browser user agent for HTTP communication |
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E-Banking Fraud: |
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| Yara detected FormBook |
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System Summary: |
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| Detected FormBook malware |
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| Malicious sample detected (through community Yara rule) |
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| Wscript starts Powershell (via cmd or directly) |
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