Analysis
- max time kernel
137s - max time network
144s - platform
windows10-2004_x64 - resource
win10v2004-20230221-en - resource tags
- submitted
18/04/2023, 10:45
General
- Target Bestar Steel RFQ 0100423(MECH)NBI April-1423.exe
- Size 743KB
- Sample230418-mtds2aah54
- SHA256 856c8bb75c2b8c79b99f9249c201d20838251a94a4f830afa7995a3af0952842
Malware Config
Extracted
-
agenttesla
-
https://api.telegram.org/bot5409839916:AAEYUYZy0IhJQAm4VXi620si4okGW8FDL2w/
Signatures
- AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
- Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs
- Looks for VMWare Tools registry key 2 TTPs 1 IoCs
- Checks BIOS information in registry 2 TTPs 2 IoCs
BIOS information is often read in order to detect sandboxing environments.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- 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
- Maps connected drives based on registry 3 TTPs 2 IoCs
Disk information is often read in order to detect sandboxing environments.
- 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 5 IoCs
- Suspicious behavior: RenamesItself 1 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 14 IoCs
- outlook_office_path 1 IoCs
- outlook_win_path 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Bestar Steel RFQ 0100423(MECH)NBI April-1423.exe"C:\Users\Admin\AppData\Local\Temp\Bestar Steel RFQ 0100423(MECH)NBI April-1423.exe"1⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Checks computer location settings
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\mDCsLcbtJNBW" /XML "C:\Users\Admin\AppData\Local\Temp\tmpD611.tmp"2⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Local\Temp\Bestar Steel RFQ 0100423(MECH)NBI April-1423.exe"{path}"2⤵
-
-
C:\Users\Admin\AppData\Local\Temp\Bestar Steel RFQ 0100423(MECH)NBI April-1423.exe"{path}"2⤵
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: RenamesItself
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- outlook_office_path
- outlook_win_path
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
tmpD611.tmp
memory/764-152-0x0000000005B80000-0x0000000005B90000-memory.dmp
memory/764-148-0x0000000006B60000-0x0000000006BB0000-memory.dmp
memory/764-147-0x0000000005B80000-0x0000000005B90000-memory.dmp
memory/764-145-0x0000000000400000-0x000000000043A000-memory.dmp
memory/796-136-0x0000000005130000-0x00000000051C2000-memory.dmp
memory/796-139-0x0000000005310000-0x0000000005320000-memory.dmp
memory/796-140-0x0000000005310000-0x0000000005320000-memory.dmp
memory/796-141-0x000000000C140000-0x000000000C1A6000-memory.dmp
memory/796-138-0x0000000005320000-0x0000000005376000-memory.dmp
memory/796-137-0x0000000005090000-0x000000000509A000-memory.dmp
memory/796-133-0x00000000005A0000-0x000000000065E000-memory.dmp
memory/796-135-0x0000000005640000-0x0000000005BE4000-memory.dmp
memory/796-134-0x0000000004F80000-0x000000000501C000-memory.dmp