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Analysis
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max time kernel
159s -
max time network
167s -
platform
windows10-2004_x64 -
resource
win10v2004-20221111-en -
resource tags
arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system -
submitted
22/11/2022, 08:38
Static task
static1
Behavioral task
behavioral1
Sample
Bank letter.exe
Resource
win7-20221111-en
Behavioral task
behavioral2
Sample
Bank letter.exe
Resource
win10v2004-20221111-en
General
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Target
Bank letter.exe
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Size
1012KB
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MD5
a58b322c74d8dfba9c022607b0d0c26b
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SHA1
380f438ad2620f1582fe9b7d5b2ba84c3d6f3349
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SHA256
322a82cb52dd04f516915780a9eb9865e24bd284fedecf938e345270fa0f83b3
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SHA512
06d2ff7e199a1be0ca7357bb8e9bdbcc63f00d1082cab4ef086f344b6b88c00e2885db5e369329220463237558a43280b0d249349511ca9d6e01f8bac13f3118
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SSDEEP
12288:SLw5APwiU251kh53ZLsVOdl0160HQV7g5D+8Egpe0kOrZsEnGvjbLhsRuDIQoiCa:IPOoSbdlYHQVGioZNtrB3m
Malware Config
Extracted
agenttesla
Protocol: smtp- Host:
mail.dmstech.in - Port:
587 - Username:
[email protected] - Password:
0]6F9Az.pqfd - Email To:
[email protected]
Signatures
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AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-4060001867-1434967833-2212371794-1000\Control Panel\International\Geo\Nation Bank letter.exe -
Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
description ioc Process Key opened \REGISTRY\USER\S-1-5-21-4060001867-1434967833-2212371794-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RegSvcs.exe Key opened \REGISTRY\USER\S-1-5-21-4060001867-1434967833-2212371794-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RegSvcs.exe Key opened \REGISTRY\USER\S-1-5-21-4060001867-1434967833-2212371794-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RegSvcs.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-4060001867-1434967833-2212371794-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\zBwkauB = "C:\\Users\\Admin\\AppData\\Roaming\\zBwkauB\\zBwkauB.exe" RegSvcs.exe -
Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 4756 set thread context of 5044 4756 Bank letter.exe 94 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 1744 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 4756 Bank letter.exe 5044 RegSvcs.exe 5044 RegSvcs.exe 5044 RegSvcs.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4756 Bank letter.exe Token: SeDebugPrivilege 5044 RegSvcs.exe -
Suspicious use of WriteProcessMemory 11 IoCs
description pid Process procid_target PID 4756 wrote to memory of 1744 4756 Bank letter.exe 92 PID 4756 wrote to memory of 1744 4756 Bank letter.exe 92 PID 4756 wrote to memory of 1744 4756 Bank letter.exe 92 PID 4756 wrote to memory of 5044 4756 Bank letter.exe 94 PID 4756 wrote to memory of 5044 4756 Bank letter.exe 94 PID 4756 wrote to memory of 5044 4756 Bank letter.exe 94 PID 4756 wrote to memory of 5044 4756 Bank letter.exe 94 PID 4756 wrote to memory of 5044 4756 Bank letter.exe 94 PID 4756 wrote to memory of 5044 4756 Bank letter.exe 94 PID 4756 wrote to memory of 5044 4756 Bank letter.exe 94 PID 4756 wrote to memory of 5044 4756 Bank letter.exe 94 -
outlook_office_path 1 IoCs
description ioc Process Key opened \REGISTRY\USER\S-1-5-21-4060001867-1434967833-2212371794-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RegSvcs.exe -
outlook_win_path 1 IoCs
description ioc Process Key opened \REGISTRY\USER\S-1-5-21-4060001867-1434967833-2212371794-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RegSvcs.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\Bank letter.exe"C:\Users\Admin\AppData\Local\Temp\Bank letter.exe"1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4756 -
C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\ZDSHLar" /XML "C:\Users\Admin\AppData\Local\Temp\tmp56BB.tmp"2⤵
- Creates scheduled task(s)
PID:1744
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"{path}"2⤵
- Accesses Microsoft Outlook profiles
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
PID:5044
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
1KB
MD52e8ddbd4a6369e791c7bba06d0c5bb62
SHA14f8410544d375be9c62a8ca8e2d4762067db30c5
SHA25634e36ae94a423a06b6352da7c649dbc8a7fad6b541b7a668426eb7af727234a3
SHA5122c32dcdb847a02b64aceda3b637f176c39b0af9e43a42c3321ef8bab8cf271fac4d7bd7db372151976ed94726d12e133c43636684cef113702fa5f020b908a3d