Analysis
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max time kernel
147s -
max time network
146s -
platform
windows7_x64 -
resource
win7v20201028 -
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
Extracted
http://vasprogramer.com/xcuaqrfwpaf/44266.9140799769.dat
http://mboard.baydevelopments.com/tkihlgt/44266.9140799769.dat
http://porcarabanchel.es/kgbpstokjetx/44266.9140799769.dat
http://klickprints.com/jcqywmbz/44266.9140799769.dat
http://werkplaats1.okker.nl/jiejgtgde/44266.9140799769.dat
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 (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process 1288 1340 rundll32.exe EXCEL.EXE Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process 1812 1340 rundll32.exe EXCEL.EXE Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process 552 1340 rundll32.exe EXCEL.EXE Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process 1964 1340 rundll32.exe EXCEL.EXE Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process 336 1340 rundll32.exe EXCEL.EXE -
Enumerates system info in registry 2 TTPs 1 IoCs
Processes:
EXCEL.EXEdescription ioc process Key opened \REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor EXCEL.EXE -
Processes:
EXCEL.EXEdescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes" EXCEL.EXE Key created \REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote EXCEL.EXE Set value (str) \REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105" EXCEL.EXE Set value (int) \REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55" EXCEL.EXE Key created \REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel EXCEL.EXE Set value (str) \REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000" EXCEL.EXE Set value (int) \REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1" EXCEL.EXE Key created \REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\Toolbar EXCEL.EXE Key created \REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt EXCEL.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
Processes:
EXCEL.EXEpid process 1340 EXCEL.EXE -
Suspicious use of SetWindowsHookEx 3 IoCs
Processes:
EXCEL.EXEpid process 1340 EXCEL.EXE 1340 EXCEL.EXE 1340 EXCEL.EXE -
Suspicious use of WriteProcessMemory 35 IoCs
Processes:
EXCEL.EXEdescription pid process target process PID 1340 wrote to memory of 1288 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1288 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1288 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1288 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1288 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1288 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1288 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1812 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1812 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1812 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1812 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1812 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1812 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1812 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 552 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 552 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 552 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 552 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 552 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 552 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 552 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1964 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1964 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1964 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1964 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1964 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1964 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 1964 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 336 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 336 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 336 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 336 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 336 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 336 1340 EXCEL.EXE rundll32.exe PID 1340 wrote to memory of 336 1340 EXCEL.EXE rundll32.exe
Processes
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C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\Complaint-Letter-1562041087-03102021.xls1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\rundll32.exerundll32 ..\Runtime.brok,DllRegisterServer2⤵
- Process spawned unexpected child process
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C:\Windows\SysWOW64\rundll32.exerundll32 ..\Runtime.brok1,DllRegisterServer2⤵
- Process spawned unexpected child process
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C:\Windows\SysWOW64\rundll32.exerundll32 ..\Runtime.brok2,DllRegisterServer2⤵
- Process spawned unexpected child process
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C:\Windows\SysWOW64\rundll32.exerundll32 ..\Runtime.brok3,DllRegisterServer2⤵
- Process spawned unexpected child process
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C:\Windows\SysWOW64\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/336-15-0x0000000000000000-mapping.dmp
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memory/552-10-0x0000000000000000-mapping.dmp
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memory/1288-6-0x0000000000000000-mapping.dmp
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memory/1288-7-0x0000000076691000-0x0000000076693000-memory.dmpFilesize
8KB
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memory/1340-2-0x000000002FBB1000-0x000000002FBB4000-memory.dmpFilesize
12KB
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memory/1340-3-0x00000000718D1000-0x00000000718D3000-memory.dmpFilesize
8KB
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memory/1340-4-0x000000005FFF0000-0x0000000060000000-memory.dmpFilesize
64KB
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memory/1400-5-0x000007FEF7D20000-0x000007FEF7F9A000-memory.dmpFilesize
2.5MB
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memory/1812-8-0x0000000000000000-mapping.dmp
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memory/1964-12-0x0000000000000000-mapping.dmp