58e8cf2a77663a1ff5cc36aa9e0777ce952eaa258c9b8220cadb5a53bed89724

Analysis

max time kernel
151s
max time network
44s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
05-02-2023 11:45

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General

Target

encodings/big5.pyc
Size

1KB
MD5

30dd3023824783afa5783270240af633
SHA1

bca37f76d3a98539e31bfb14de232895d5749979
SHA256

9ba263ce55ad578a24b415b92ea6a40c535107910b569a3b0eb3800838f529a8
SHA512

361c23253d6bd4e132401201cc42917b7ad4e18ea0002e77d23403df7b9ad331300fb1b9cf7ae5b9b977100de19a9c7835bc5d6c3c1192cc84e98ad59b887880

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-1-5-21-999675638-2867687379-27515722-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\MuiCache	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\pyc_auto_file	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\pyc_auto_file\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\pyc_auto_file\shell\Read\command	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_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-1-5-21-999675638-2867687379-27515722-1000_Classes\Local Settings	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\.pyc	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\.pyc\ = "pyc_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\pyc_auto_file\shell\Read	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\pyc_auto_file\shell	rundll32.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

AcroRd32.exe

pid process

1760 AcroRd32.exe
1760 AcroRd32.exe
1760 AcroRd32.exe

pid	process
1760	AcroRd32.exe
1760	AcroRd32.exe
1760	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

cmd.exerundll32.exe

description	pid	process	target process
PID 1476 wrote to memory of 1020	1476	cmd.exe	rundll32.exe
PID 1476 wrote to memory of 1020	1476	cmd.exe	rundll32.exe
PID 1476 wrote to memory of 1020	1476	cmd.exe	rundll32.exe
PID 1020 wrote to memory of 1760	1020	rundll32.exe	AcroRd32.exe
PID 1020 wrote to memory of 1760	1020	rundll32.exe	AcroRd32.exe
PID 1020 wrote to memory of 1760	1020	rundll32.exe	AcroRd32.exe
PID 1020 wrote to memory of 1760	1020	rundll32.exe	AcroRd32.exe

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\encodings\big5.pyc
1⤵
- Suspicious use of WriteProcessMemory
PID:1476

C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\encodings\big5.pyc
2⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1020

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\big5.pyc"
3⤵
- Suspicious use of SetWindowsHookEx
PID:1760

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/1020-76-0x0000000000000000-mapping.dmp

Download
memory/1476-54-0x000007FEFB5D1000-0x000007FEFB5D3000-memory.dmp

Filesize
8KB

Download
memory/1760-81-0x0000000000000000-mapping.dmp

Download
memory/1760-82-0x0000000074C11000-0x0000000074C13000-memory.dmp

Filesize
8KB

Download