Analysis
- max time kernel
147s - max time network
51s - platform
windows7_x64 - resource
win7v20210408 - submitted
02/09/2021, 12:26
General
- Target Inquiry Sheet xls.exe
- Size 664KB
- Sample210902-ws6bpg45bx
- SHA256 39a29076dcbc4e24ca1f0c2ad1abd16d136929c67bf52c5fae71023f77c54cf1
Malware Config
Extracted
-
agenttesla
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Protocol
smtp
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Host
mail.palletsolutions.ca
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Port
587
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Username
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Password
h~Q+QV.(M2?!
Signatures
- AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
- AgentTesla Payload 3 IoCs
- Looks for VirtualBox Guest Additions in registry 2 TTPs
- Looks for VMWare Tools registry key 2 TTPs
- Checks BIOS information in registry 2 TTPs 2 IoCs
BIOS information is often read in order to detect sandboxing environments.
- 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.
- 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 9 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 21 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\Inquiry Sheet xls.exe"C:\Users\Admin\AppData\Local\Temp\Inquiry Sheet xls.exe"1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\Inquiry Sheet xls.exe"2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\IxosHS" /XML "C:\Users\Admin\AppData\Local\Temp\tmp1140.tmp"2⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Temp\Inquiry Sheet xls.exe"C:\Users\Admin\AppData\Local\Temp\Inquiry Sheet xls.exe"2⤵
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C:\Users\Admin\AppData\Local\Temp\Inquiry Sheet xls.exe"C:\Users\Admin\AppData\Local\Temp\Inquiry Sheet xls.exe"2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
memory/520-60-0x0000000000A20000-0x0000000000A21000-memory.dmp
memory/520-62-0x0000000004F20000-0x0000000004F21000-memory.dmp
memory/520-63-0x00000000003E0000-0x00000000003F6000-memory.dmp
memory/520-64-0x00000000049A0000-0x00000000049FD000-memory.dmp
memory/520-65-0x0000000000570000-0x00000000005A8000-memory.dmp
memory/1584-82-0x0000000006090000-0x0000000006091000-memory.dmp
memory/1584-89-0x000000007EF30000-0x000000007EF31000-memory.dmp
memory/1584-68-0x0000000000AB0000-0x0000000000AB1000-memory.dmp
memory/1584-69-0x0000000004840000-0x0000000004841000-memory.dmp
memory/1584-70-0x0000000000DA0000-0x0000000000DA1000-memory.dmp
memory/1584-71-0x0000000000DA2000-0x0000000000DA3000-memory.dmp
memory/1584-112-0x0000000006310000-0x0000000006311000-memory.dmp
memory/1584-111-0x0000000006300000-0x0000000006301000-memory.dmp
memory/1584-97-0x00000000055D0000-0x00000000055D1000-memory.dmp
memory/1584-96-0x0000000006280000-0x0000000006281000-memory.dmp
memory/1584-67-0x0000000075891000-0x0000000075893000-memory.dmp
memory/1584-78-0x00000000025A0000-0x00000000025A1000-memory.dmp
memory/1584-79-0x0000000002790000-0x0000000002791000-memory.dmp
memory/1584-87-0x00000000060D0000-0x00000000060D1000-memory.dmp
memory/1584-88-0x0000000006100000-0x0000000006101000-memory.dmp
memory/2016-77-0x00000000042F0000-0x00000000042F1000-memory.dmp
memory/2016-75-0x0000000000400000-0x000000000043C000-memory.dmp
memory/2016-73-0x0000000000400000-0x000000000043C000-memory.dmp
memory/2016-113-0x00000000042F1000-0x00000000042F2000-memory.dmp