Analysis
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max time kernel
91s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20220414-en -
submitted
21-05-2022 12:03
Static task
static1
Behavioral task
behavioral1
Sample
DHL_overdue account letter.PDF.exe
Resource
win7-20220414-en
Behavioral task
behavioral2
Sample
DHL_overdue account letter.PDF.exe
Resource
win10v2004-20220414-en
General
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Target
DHL_overdue account letter.PDF.exe
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Size
424KB
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MD5
f0b3e2a7cef0d4e0c6e094676550221a
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SHA1
fc8cddcf6526cd3ee94141b6299c7069ad1b19b0
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SHA256
6ae9b8c271b5110c7cceb8b7d39522dd8d444dddcfa3691726ff3580562a73b7
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SHA512
3a0f6d6e979871ecdf4cce66e63674ecd32568f0d45f91448b0bb986fccbbf3173734f992d6c0add58c5437fd048e36c4b00bd8efcbcf5c161b35b8c7e26178a
Malware Config
Extracted
agenttesla
Protocol: smtp- Host:
mail.microtechlab.in - Port:
587 - Username:
[email protected] - Password:
pune@123
Signatures
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AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
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AgentTesla Payload 1 IoCs
Processes:
resource yara_rule behavioral2/memory/328-137-0x0000000000400000-0x0000000000452000-memory.dmp family_agenttesla -
Disables Task Manager via registry modification
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Drops file in Drivers directory 1 IoCs
Processes:
RegSvcs.exedescription ioc process File opened for modification C:\Windows\system32\drivers\etc\hosts RegSvcs.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
DHL_overdue account letter.PDF.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\Control Panel\International\Geo\Nation DHL_overdue account letter.PDF.exe -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
RegSvcs.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\CpSnJ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\CpSnJ\\CpSnJ.exe" RegSvcs.exe -
Suspicious use of SetThreadContext 1 IoCs
Processes:
DHL_overdue account letter.PDF.exedescription pid process target process PID 5104 set thread context of 328 5104 DHL_overdue account letter.PDF.exe RegSvcs.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Program crash 1 IoCs
Processes:
WerFault.exepid pid_target process target process 3924 328 WerFault.exe RegSvcs.exe -
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Modifies registry key 1 TTPs 1 IoCs
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Suspicious behavior: EnumeratesProcesses 3 IoCs
Processes:
DHL_overdue account letter.PDF.exeRegSvcs.exepid process 5104 DHL_overdue account letter.PDF.exe 328 RegSvcs.exe 328 RegSvcs.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
DHL_overdue account letter.PDF.exeRegSvcs.exedescription pid process Token: SeDebugPrivilege 5104 DHL_overdue account letter.PDF.exe Token: SeDebugPrivilege 328 RegSvcs.exe -
Suspicious use of WriteProcessMemory 17 IoCs
Processes:
DHL_overdue account letter.PDF.exeRegSvcs.exedescription pid process target process PID 5104 wrote to memory of 4076 5104 DHL_overdue account letter.PDF.exe schtasks.exe PID 5104 wrote to memory of 4076 5104 DHL_overdue account letter.PDF.exe schtasks.exe PID 5104 wrote to memory of 4076 5104 DHL_overdue account letter.PDF.exe schtasks.exe PID 5104 wrote to memory of 328 5104 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 5104 wrote to memory of 328 5104 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 5104 wrote to memory of 328 5104 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 5104 wrote to memory of 328 5104 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 5104 wrote to memory of 328 5104 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 5104 wrote to memory of 328 5104 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 5104 wrote to memory of 328 5104 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 5104 wrote to memory of 328 5104 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 328 wrote to memory of 3732 328 RegSvcs.exe REG.exe PID 328 wrote to memory of 3732 328 RegSvcs.exe REG.exe PID 328 wrote to memory of 3732 328 RegSvcs.exe REG.exe PID 328 wrote to memory of 4752 328 RegSvcs.exe netsh.exe PID 328 wrote to memory of 4752 328 RegSvcs.exe netsh.exe PID 328 wrote to memory of 4752 328 RegSvcs.exe netsh.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\DHL_overdue account letter.PDF.exe"C:\Users\Admin\AppData\Local\Temp\DHL_overdue account letter.PDF.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\eigBEJpNrvdNDs" /XML "C:\Users\Admin\AppData\Local\Temp\tmp4016.tmp"2⤵
- Creates scheduled task(s)
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"{path}"2⤵
- Drops file in Drivers directory
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\REG.exeREG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f3⤵
- Modifies registry key
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C:\Windows\SysWOW64\netsh.exe"netsh" wlan show profile3⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 328 -s 15923⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 328 -ip 3281⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\Local\Temp\tmp4016.tmpFilesize
1KB
MD58468c479593f6a7be4ed3c7efd567319
SHA12f009a29cf21135297f8ba8b88ef15a81f1fe843
SHA256d775d225f37fade152fce70a69de8a8851e6669d7bee900a906bdfce989d4fa3
SHA51283162df381fabeea032a90e199944549f82612095861d2ea74ae3503285c2bf07c8481b35e371474e27583317203a86d34ac5cc3cfd37ef6d795ea4e39e1d43b
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memory/328-136-0x0000000000000000-mapping.dmp
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memory/328-137-0x0000000000400000-0x0000000000452000-memory.dmpFilesize
328KB
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memory/328-138-0x0000000006630000-0x0000000006696000-memory.dmpFilesize
408KB
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memory/328-140-0x0000000006C70000-0x0000000006CC0000-memory.dmpFilesize
320KB
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memory/3732-139-0x0000000000000000-mapping.dmp
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memory/4076-134-0x0000000000000000-mapping.dmp
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memory/4752-141-0x0000000000000000-mapping.dmp
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memory/5104-130-0x0000000000A70000-0x0000000000AE0000-memory.dmpFilesize
448KB
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memory/5104-131-0x0000000005440000-0x00000000054DC000-memory.dmpFilesize
624KB
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memory/5104-132-0x00000000055A0000-0x0000000005632000-memory.dmpFilesize
584KB
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memory/5104-133-0x00000000062A0000-0x0000000006844000-memory.dmpFilesize
5.6MB