Analysis
- max time kernel
132s - max time network
140s - platform
windows10-2004_x64 - resource
win10v2004-20220901-en - resource tags
- submitted
16/02/2023, 12:16
General
- Target Proforma invoice.exe
- Size 633KB
- Sample230216-pffrkshb21
- SHA256 71d07c6a2d2c936d68d34be26e8db95e47a616d30521f128feb2e79fbbaff469
Malware Config
Extracted
-
Protocol
smtp
-
Host
mail.ljmaintenancesvcs.com.sg
-
Port
587
-
Username
-
Password
Steven@12345
Extracted
-
agenttesla
-
Protocol
smtp
-
Host
mail.ljmaintenancesvcs.com.sg
-
Port
587
-
Username
-
Password
Steven@12345
-
Email to
Signatures
- AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
- Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Suspicious use of SetThreadContext 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 3 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 14 IoCs
- outlook_office_path 1 IoCs
- outlook_win_path 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Proforma invoice.exe"C:\Users\Admin\AppData\Local\Temp\Proforma invoice.exe"1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\jIUXhaqkr" /XML "C:\Users\Admin\AppData\Local\Temp\tmp21FF.tmp"2⤵
- Creates scheduled task(s)
-
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C:\Users\Admin\AppData\Local\Temp\Proforma invoice.exe"{path}"2⤵
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C:\Users\Admin\AppData\Local\Temp\Proforma invoice.exe"{path}"2⤵
- Accesses Microsoft Outlook profiles
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
Proforma invoice.exe.log
tmp21FF.tmp
memory/1792-141-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1792-143-0x0000000004EF0000-0x0000000004F56000-memory.dmp
memory/1792-144-0x0000000006A10000-0x0000000006A60000-memory.dmp
memory/1792-145-0x0000000006C30000-0x0000000006DF2000-memory.dmp
memory/3544-136-0x0000000004B40000-0x0000000004B4A000-memory.dmp
memory/3544-135-0x0000000004BE0000-0x0000000004C7C000-memory.dmp
memory/3544-134-0x0000000004AA0000-0x0000000004B32000-memory.dmp
memory/3544-132-0x0000000000070000-0x0000000000114000-memory.dmp
memory/3544-133-0x0000000004FB0000-0x0000000005554000-memory.dmp