Analysis
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max time kernel
151s -
max time network
151s -
platform
windows10_x64 -
resource
win10-en-20211208 -
submitted
13-01-2022 09:09
Behavioral task
behavioral1
Sample
lB_39.xlsm
Resource
win7-en-20211208
Behavioral task
behavioral2
Sample
lB_39.xlsm
Resource
win10-en-20211208
General
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Target
lB_39.xlsm
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Size
84KB
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MD5
ca40024e1f730cb8775a13d96f73b734
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SHA1
fcb6c0e0fed10e795558bd3242d18f1f47245991
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SHA256
ae4c37f20738b2bc766ca1b1437dd27be15c5a86e663f8ce3fc8be6762483305
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SHA512
1134b50655628f2470d987e1e3d298378485baa73d7c0daeeb35b3993869dff3740568468d68b19185f5489f82682c741745c7919a738019179bfdf5039fc9e4
Malware Config
Extracted
http://test.la-boticaria.com/wp-content/xAQZIPYs1tavxAz/
Signatures
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Process spawned unexpected child process 1 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
Processes:
rundll32.exedescription pid pid_target process target process Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process 2648 2720 rundll32.exe EXCEL.EXE -
Blocklisted process makes network request 1 IoCs
Processes:
rundll32.exeflow pid process 43 3648 rundll32.exe -
Downloads MZ/PE file
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Loads dropped DLL 2 IoCs
Processes:
rundll32.exerundll32.exepid process 2648 rundll32.exe 2472 rundll32.exe -
Drops file in System32 directory 1 IoCs
Processes:
rundll32.exedescription ioc process File opened for modification C:\Windows\SysWOW64\Ursmaprqtwcoyvtv\mkzdwhx.gdv rundll32.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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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 2720 EXCEL.EXE -
Suspicious behavior: EnumeratesProcesses 2 IoCs
Processes:
rundll32.exepid process 3648 rundll32.exe 3648 rundll32.exe -
Suspicious use of SetWindowsHookEx 12 IoCs
Processes:
EXCEL.EXEpid process 2720 EXCEL.EXE 2720 EXCEL.EXE 2720 EXCEL.EXE 2720 EXCEL.EXE 2720 EXCEL.EXE 2720 EXCEL.EXE 2720 EXCEL.EXE 2720 EXCEL.EXE 2720 EXCEL.EXE 2720 EXCEL.EXE 2720 EXCEL.EXE 2720 EXCEL.EXE -
Suspicious use of WriteProcessMemory 12 IoCs
Processes:
EXCEL.EXErundll32.exerundll32.exerundll32.exedescription pid process target process PID 2720 wrote to memory of 2648 2720 EXCEL.EXE rundll32.exe PID 2720 wrote to memory of 2648 2720 EXCEL.EXE rundll32.exe PID 2720 wrote to memory of 2648 2720 EXCEL.EXE rundll32.exe PID 2648 wrote to memory of 2472 2648 rundll32.exe rundll32.exe PID 2648 wrote to memory of 2472 2648 rundll32.exe rundll32.exe PID 2648 wrote to memory of 2472 2648 rundll32.exe rundll32.exe PID 2472 wrote to memory of 3148 2472 rundll32.exe rundll32.exe PID 2472 wrote to memory of 3148 2472 rundll32.exe rundll32.exe PID 2472 wrote to memory of 3148 2472 rundll32.exe rundll32.exe PID 3148 wrote to memory of 3648 3148 rundll32.exe rundll32.exe PID 3148 wrote to memory of 3648 3148 rundll32.exe rundll32.exe PID 3148 wrote to memory of 3648 3148 rundll32.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\lB_39.xlsm"1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2720 -
C:\Windows\SysWow64\rundll32.exeC:\Windows\SysWow64\rundll32.exe ..\einl.ocx,D"&"l"&"lR"&"egister"&"Serve"&"r2⤵
- Process spawned unexpected child process
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2648 -
C:\Windows\SysWOW64\rundll32.exeC:\Windows\SysWOW64\rundll32.exe "C:\Users\Admin\einl.ocx",DllRegisterServer3⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:2472 -
C:\Windows\SysWOW64\rundll32.exeC:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Ursmaprqtwcoyvtv\mkzdwhx.gdv",mRNjcIBJm4⤵
- Suspicious use of WriteProcessMemory
PID:3148 -
C:\Windows\SysWOW64\rundll32.exeC:\Windows\SysWOW64\rundll32.exe "C:\Windows\System32\Ursmaprqtwcoyvtv\mkzdwhx.gdv",DllRegisterServer5⤵
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
PID:3648
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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MD5
4ec833cec47e0e1f2138f6e558615517
SHA131b49458c9dd32b800b9dc056d29d70040857fcb
SHA256c981e06aaf25e578c18f21c6875663aa4dccc44c325826ea82e699639bc48392
SHA512dbc9e6ae3b77ea2670b1860c39f88a3f2dfce89d4630b56d804f151ff80e22d6c63f5262efb5f88afc38f6c4d2bab4f6004d6e8d5afd4b57421160c16fe61300
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MD5
4ec833cec47e0e1f2138f6e558615517
SHA131b49458c9dd32b800b9dc056d29d70040857fcb
SHA256c981e06aaf25e578c18f21c6875663aa4dccc44c325826ea82e699639bc48392
SHA512dbc9e6ae3b77ea2670b1860c39f88a3f2dfce89d4630b56d804f151ff80e22d6c63f5262efb5f88afc38f6c4d2bab4f6004d6e8d5afd4b57421160c16fe61300
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MD5
4ec833cec47e0e1f2138f6e558615517
SHA131b49458c9dd32b800b9dc056d29d70040857fcb
SHA256c981e06aaf25e578c18f21c6875663aa4dccc44c325826ea82e699639bc48392
SHA512dbc9e6ae3b77ea2670b1860c39f88a3f2dfce89d4630b56d804f151ff80e22d6c63f5262efb5f88afc38f6c4d2bab4f6004d6e8d5afd4b57421160c16fe61300