Analysis
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max time kernel
63s -
max time network
81s -
platform
windows7_x64 -
resource
win7v20201028 -
submitted
11-03-2021 05:01
Behavioral task
behavioral1
Sample
3572.xls
Resource
win7v20201028
Behavioral task
behavioral2
Sample
3572.xls
Resource
win10v20201028
General
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Target
3572.xls
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Size
59KB
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MD5
e80a7046b46c018961a88648f1f4b925
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SHA1
86f92d518e7e7b565b6bcea41c4500c603687958
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SHA256
951d0178fa25e42ca2bbd7f30e59936d98824a98c17e2abb766418fd4589b04d
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SHA512
192b3da5129d7c440e66899a9ca30d83ce4ed8e41bb13ef01e12c92f954ebe3d53b9bf301ac610387a3e2654b14589d044cc00daed3ca8f18587aabf44e8fca3
Malware Config
Extracted
https://derocktech.com/k.php
Signatures
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Process spawned unexpected child process 2 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
Processes:
reg.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 268 1636 reg.exe EXCEL.EXE Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process 1356 1636 rundll32.exe EXCEL.EXE -
Deletes itself 1 IoCs
Processes:
EXCEL.EXEpid process 1636 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-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes" EXCEL.EXE Set value (int) \REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55" EXCEL.EXE Set value (str) \REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105" EXCEL.EXE Key created \REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel EXCEL.EXE Set value (str) \REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\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-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1" EXCEL.EXE Key created \REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar EXCEL.EXE Key created \REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt EXCEL.EXE Key created \REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote EXCEL.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
Processes:
EXCEL.EXEpid process 1636 EXCEL.EXE -
Suspicious use of SetWindowsHookEx 14 IoCs
Processes:
EXCEL.EXEpid process 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE 1636 EXCEL.EXE -
Suspicious use of WriteProcessMemory 11 IoCs
Processes:
EXCEL.EXEdescription pid process target process PID 1636 wrote to memory of 268 1636 EXCEL.EXE reg.exe PID 1636 wrote to memory of 268 1636 EXCEL.EXE reg.exe PID 1636 wrote to memory of 268 1636 EXCEL.EXE reg.exe PID 1636 wrote to memory of 268 1636 EXCEL.EXE reg.exe PID 1636 wrote to memory of 1356 1636 EXCEL.EXE rundll32.exe PID 1636 wrote to memory of 1356 1636 EXCEL.EXE rundll32.exe PID 1636 wrote to memory of 1356 1636 EXCEL.EXE rundll32.exe PID 1636 wrote to memory of 1356 1636 EXCEL.EXE rundll32.exe PID 1636 wrote to memory of 1356 1636 EXCEL.EXE rundll32.exe PID 1636 wrote to memory of 1356 1636 EXCEL.EXE rundll32.exe PID 1636 wrote to memory of 1356 1636 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\3572.xls1⤵
- Deletes itself
- 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\reg.exe"C:\Windows\system32\reg.exe" EXPORT HKCU\Software\Microsoft\Office\14.0\Excel\Security C:\Users\Public\Documents\pi65.txt /y2⤵
- Process spawned unexpected child process
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C:\Windows\SysWOW64\rundll32.exe"C:\Windows\system32\rundll32.exe" C:\Users\Public\Documents\pKz9KLk.txt,DllRegisterServer2⤵
- Process spawned unexpected child process
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
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C:\Users\Public\Documents\pi65.txtMD5
1084b35cb1aecef496dfdb263760a40c
SHA143d95f062749f3143838fe39460b3c5d541e194a
SHA25648ccd7a8ed9873ff73eec7252ed9ce2882389aa43a5ec5ad072168c43320b25c
SHA5129dbcfe0f39e04700f252b95cfb73a7977fe7a2ffe8de98510c9f62988300754c4e8eeb0a152ad87db71b28ee8c2fcb97d136215d2898ccbee5b8837a31eb7212
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memory/268-5-0x0000000000000000-mapping.dmp
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memory/1356-8-0x0000000000000000-mapping.dmp
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memory/1356-9-0x00000000761E1000-0x00000000761E3000-memory.dmpFilesize
8KB
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memory/1516-7-0x000007FEF6380000-0x000007FEF65FA000-memory.dmpFilesize
2.5MB
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memory/1636-2-0x000000002F0F1000-0x000000002F0F4000-memory.dmpFilesize
12KB
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memory/1636-3-0x0000000071521000-0x0000000071523000-memory.dmpFilesize
8KB
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memory/1636-4-0x000000005FFF0000-0x0000000060000000-memory.dmpFilesize
64KB