Analysis
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max time kernel
147s -
max time network
46s -
platform
windows7_x64 -
resource
win7-20220414-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:
reports@microtechlab.in - 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 6 IoCs
Processes:
resource yara_rule behavioral1/memory/1632-63-0x0000000000400000-0x0000000000452000-memory.dmp family_agenttesla behavioral1/memory/1632-64-0x0000000000400000-0x0000000000452000-memory.dmp family_agenttesla behavioral1/memory/1632-65-0x0000000000400000-0x0000000000452000-memory.dmp family_agenttesla behavioral1/memory/1632-66-0x000000000044CF5E-mapping.dmp family_agenttesla behavioral1/memory/1632-68-0x0000000000400000-0x0000000000452000-memory.dmp family_agenttesla behavioral1/memory/1632-70-0x0000000000400000-0x0000000000452000-memory.dmp family_agenttesla -
ReZer0 packer 1 IoCs
Detects ReZer0, a packer with multiple versions used in various campaigns.
Processes:
resource yara_rule behavioral1/memory/1992-56-0x0000000000B80000-0x0000000000BD8000-memory.dmp rezer0 -
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 -
Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
Processes:
RegSvcs.exedescription ioc process Key opened \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RegSvcs.exe Key opened \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RegSvcs.exe Key opened \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RegSvcs.exe -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
RegSvcs.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\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 1992 set thread context of 1632 1992 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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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 1992 DHL_overdue account letter.PDF.exe 1632 RegSvcs.exe 1632 RegSvcs.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
DHL_overdue account letter.PDF.exeRegSvcs.exedescription pid process Token: SeDebugPrivilege 1992 DHL_overdue account letter.PDF.exe Token: SeDebugPrivilege 1632 RegSvcs.exe -
Suspicious use of WriteProcessMemory 24 IoCs
Processes:
DHL_overdue account letter.PDF.exeRegSvcs.exedescription pid process target process PID 1992 wrote to memory of 1820 1992 DHL_overdue account letter.PDF.exe schtasks.exe PID 1992 wrote to memory of 1820 1992 DHL_overdue account letter.PDF.exe schtasks.exe PID 1992 wrote to memory of 1820 1992 DHL_overdue account letter.PDF.exe schtasks.exe PID 1992 wrote to memory of 1820 1992 DHL_overdue account letter.PDF.exe schtasks.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1992 wrote to memory of 1632 1992 DHL_overdue account letter.PDF.exe RegSvcs.exe PID 1632 wrote to memory of 892 1632 RegSvcs.exe REG.exe PID 1632 wrote to memory of 892 1632 RegSvcs.exe REG.exe PID 1632 wrote to memory of 892 1632 RegSvcs.exe REG.exe PID 1632 wrote to memory of 892 1632 RegSvcs.exe REG.exe PID 1632 wrote to memory of 1596 1632 RegSvcs.exe netsh.exe PID 1632 wrote to memory of 1596 1632 RegSvcs.exe netsh.exe PID 1632 wrote to memory of 1596 1632 RegSvcs.exe netsh.exe PID 1632 wrote to memory of 1596 1632 RegSvcs.exe netsh.exe -
outlook_office_path 1 IoCs
Processes:
RegSvcs.exedescription ioc process Key opened \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RegSvcs.exe -
outlook_win_path 1 IoCs
Processes:
RegSvcs.exedescription ioc process Key opened \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RegSvcs.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\DHL_overdue account letter.PDF.exe"C:\Users\Admin\AppData\Local\Temp\DHL_overdue account letter.PDF.exe"1⤵
- 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\tmp8B5F.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
- Accesses Microsoft Outlook profiles
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
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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⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\Local\Temp\tmp8B5F.tmpFilesize
1KB
MD55c8b4f321a27b321771ffe86a65e4c13
SHA1d0bab6ebb3586c98ca796811592fc7417a0231ac
SHA2563abd5952b758d40d2328e9c4d70333a9eb060f0015510d4b360d71d40d630be0
SHA512a77c1ee60fb81372c394cca297b239e12165e8334da5525ac853a8b7c221929d0fd3b6648b595bba719d201fc02bfc4a528df6e310158fdb1a91be4b26bb45a8
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memory/892-72-0x0000000000000000-mapping.dmp
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memory/1596-73-0x0000000000000000-mapping.dmp
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memory/1632-68-0x0000000000400000-0x0000000000452000-memory.dmpFilesize
328KB
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memory/1632-60-0x0000000000400000-0x0000000000452000-memory.dmpFilesize
328KB
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memory/1632-61-0x0000000000400000-0x0000000000452000-memory.dmpFilesize
328KB
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memory/1632-63-0x0000000000400000-0x0000000000452000-memory.dmpFilesize
328KB
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memory/1632-64-0x0000000000400000-0x0000000000452000-memory.dmpFilesize
328KB
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memory/1632-65-0x0000000000400000-0x0000000000452000-memory.dmpFilesize
328KB
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memory/1632-66-0x000000000044CF5E-mapping.dmp
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memory/1632-70-0x0000000000400000-0x0000000000452000-memory.dmpFilesize
328KB
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memory/1820-58-0x0000000000000000-mapping.dmp
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memory/1992-57-0x00000000751C1000-0x00000000751C3000-memory.dmpFilesize
8KB
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memory/1992-54-0x00000000012A0000-0x0000000001310000-memory.dmpFilesize
448KB
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memory/1992-56-0x0000000000B80000-0x0000000000BD8000-memory.dmpFilesize
352KB
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memory/1992-55-0x0000000000260000-0x0000000000268000-memory.dmpFilesize
32KB