Analysis
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max time kernel
136s -
max time network
132s -
platform
windows10_x64 -
resource
win10v20201028 -
submitted
11-03-2021 20:59
Behavioral task
behavioral1
Sample
Complaint-Letter-1562041087-03102021.xls
Resource
win7v20201028
Behavioral task
behavioral2
Sample
Complaint-Letter-1562041087-03102021.xls
Resource
win10v20201028
General
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Target
Complaint-Letter-1562041087-03102021.xls
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Size
276KB
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MD5
97f27473726b5df577af145b2c6446c9
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SHA1
9c670a3fbad0d5f32913a1d823aeed4210cdb8cd
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SHA256
6324f93b071899aefccb5d511efa75ced57554a51ef6c6281cafde5a78febcfc
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SHA512
dce62d4d96aaab916b502d0873a70320c71af072b489954555ca3969cb575ca7dcfa29020153f8350b3fad40291861546e0bb0f0f8bf3e8b2abd682e287b47c5
Malware Config
Signatures
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Process spawned unexpected child process 5 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
Processes:
rundll32.exerundll32.exerundll32.exerundll32.exerundll32.exedescription pid pid_target process target process Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process 4084 4632 rundll32.exe EXCEL.EXE Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process 2196 4632 rundll32.exe EXCEL.EXE Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process 3048 4632 rundll32.exe EXCEL.EXE Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process 576 4632 rundll32.exe EXCEL.EXE Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process 840 4632 rundll32.exe EXCEL.EXE -
Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
EXCEL.EXEdescription ioc process Key opened \REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0 EXCEL.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz EXCEL.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString EXCEL.EXE -
Enumerates system info in registry 2 TTPs 3 IoCs
Processes:
EXCEL.EXEdescription ioc process Key opened \REGISTRY\MACHINE\Hardware\Description\System\BIOS EXCEL.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily EXCEL.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU EXCEL.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
Processes:
EXCEL.EXEpid process 4632 EXCEL.EXE -
Suspicious use of FindShellTrayWindow 2 IoCs
Processes:
EXCEL.EXEpid process 4632 EXCEL.EXE 4632 EXCEL.EXE -
Suspicious use of SetWindowsHookEx 14 IoCs
Processes:
EXCEL.EXEpid process 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE 4632 EXCEL.EXE -
Suspicious use of WriteProcessMemory 10 IoCs
Processes:
EXCEL.EXEdescription pid process target process PID 4632 wrote to memory of 4084 4632 EXCEL.EXE rundll32.exe PID 4632 wrote to memory of 4084 4632 EXCEL.EXE rundll32.exe PID 4632 wrote to memory of 2196 4632 EXCEL.EXE rundll32.exe PID 4632 wrote to memory of 2196 4632 EXCEL.EXE rundll32.exe PID 4632 wrote to memory of 3048 4632 EXCEL.EXE rundll32.exe PID 4632 wrote to memory of 3048 4632 EXCEL.EXE rundll32.exe PID 4632 wrote to memory of 576 4632 EXCEL.EXE rundll32.exe PID 4632 wrote to memory of 576 4632 EXCEL.EXE rundll32.exe PID 4632 wrote to memory of 840 4632 EXCEL.EXE rundll32.exe PID 4632 wrote to memory of 840 4632 EXCEL.EXE rundll32.exe
Processes
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C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\Complaint-Letter-1562041087-03102021.xls"1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\rundll32.exerundll32 ..\Runtime.brok,DllRegisterServer2⤵
- Process spawned unexpected child process
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C:\Windows\SYSTEM32\rundll32.exerundll32 ..\Runtime.brok1,DllRegisterServer2⤵
- Process spawned unexpected child process
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C:\Windows\SYSTEM32\rundll32.exerundll32 ..\Runtime.brok2,DllRegisterServer2⤵
- Process spawned unexpected child process
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C:\Windows\SYSTEM32\rundll32.exerundll32 ..\Runtime.brok3,DllRegisterServer2⤵
- Process spawned unexpected child process
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C:\Windows\SYSTEM32\rundll32.exerundll32 ..\Runtime.brok4,DllRegisterServer2⤵
- Process spawned unexpected child process
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\Runtime.brok3MD5
507c882f74f91b75c1564075376eb794
SHA1099e7b5c2f14c58793520eccb3c495bfed0ebe67
SHA256c601e25a289eebd33d754a6fc4e978656f77e2f0d35a3b79afe7f658007839fe
SHA5124f7c4cc750bbe8d76d9cfe6fb021cadb5a2e0eec3d4072e5f418fcc65380a09e7607e58d8aecc7c154eaccae16c6133f7878e7015eafc8759a9b6ff92abd9cce
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memory/576-10-0x0000000000000000-mapping.dmp
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memory/840-12-0x0000000000000000-mapping.dmp
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memory/2196-8-0x0000000000000000-mapping.dmp
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memory/3048-9-0x0000000000000000-mapping.dmp
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memory/4084-7-0x0000000000000000-mapping.dmp
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memory/4632-2-0x00007FF9A2350000-0x00007FF9A2360000-memory.dmpFilesize
64KB
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memory/4632-3-0x00007FF9A2350000-0x00007FF9A2360000-memory.dmpFilesize
64KB
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memory/4632-4-0x00007FF9A2350000-0x00007FF9A2360000-memory.dmpFilesize
64KB
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memory/4632-5-0x00007FF9C90B0000-0x00007FF9C96E7000-memory.dmpFilesize
6.2MB
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memory/4632-6-0x00007FF9A2350000-0x00007FF9A2360000-memory.dmpFilesize
64KB