58e8cf2a77663a1ff5cc36aa9e0777ce952eaa258c9b8220cadb5a53bed89724

Analysis

max time kernel
150s
max time network
34s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
05-02-2023 11:45

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General

Target

encodings/big5hkscs.pyc
Size

1KB
MD5

858c2aed1b411db7f240127f465907be
SHA1

cf54bc905de4425f38531ea1abd15e624946f9c9
SHA256

91a65aa014bed7de528559afea50b1d31fa03df301144ae9cf3a062be7cf7dbd
SHA512

98e10efc0594f9066d43323b339cdd7402ada87ff8e1bfa723351f19dd600a13b98151db0a947f3d1e0994cd99f92cd5e4570ff1c4c64000006d8a1047686224

Score

3^/10

Malware Config

Signatures

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies registry class 10 IoCs

Processes:

rundll32.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\pyc_auto_file	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\pyc_auto_file\shell\Read\command\ = "\"C:\\Program Files (x86)\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\" \"%1\""	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_Classes\Local Settings	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\MuiCache	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\pyc_auto_file\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\.pyc	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\.pyc\ = "pyc_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\pyc_auto_file\shell\Read	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\pyc_auto_file\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\pyc_auto_file\shell\Read\command	rundll32.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

AcroRd32.exe

pid process

1800 AcroRd32.exe
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

AcroRd32.exe

pid process

1800 AcroRd32.exe
1800 AcroRd32.exe
1800 AcroRd32.exe

pid	process
1800	AcroRd32.exe

pid	process
1800	AcroRd32.exe
1800	AcroRd32.exe
1800	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

cmd.exerundll32.exe

description	pid	process	target process
PID 1616 wrote to memory of 1324	1616	cmd.exe	rundll32.exe
PID 1616 wrote to memory of 1324	1616	cmd.exe	rundll32.exe
PID 1616 wrote to memory of 1324	1616	cmd.exe	rundll32.exe
PID 1324 wrote to memory of 1800	1324	rundll32.exe	AcroRd32.exe
PID 1324 wrote to memory of 1800	1324	rundll32.exe	AcroRd32.exe
PID 1324 wrote to memory of 1800	1324	rundll32.exe	AcroRd32.exe
PID 1324 wrote to memory of 1800	1324	rundll32.exe	AcroRd32.exe

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\encodings\big5hkscs.pyc
1⤵
- Suspicious use of WriteProcessMemory
PID:1616

C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\encodings\big5hkscs.pyc
2⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1324

C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe
"C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe" "C:\Users\Admin\AppData\Local\Temp\encodings\big5hkscs.pyc"
3⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
PID:1800

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/1324-76-0x0000000000000000-mapping.dmp

Download
memory/1616-54-0x000007FEFC2C1000-0x000007FEFC2C3000-memory.dmp

Filesize
8KB

Download
memory/1800-81-0x0000000000000000-mapping.dmp

Download
memory/1800-82-0x0000000075C81000-0x0000000075C83000-memory.dmp

Filesize
8KB

Download