58e8cf2a77663a1ff5cc36aa9e0777ce952eaa258c9b8220cadb5a53bed89724

Analysis

max time kernel
150s
max time network
41s
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

_weakrefset.pyc
Size

7KB
MD5

1d2e7b3f64f73eebd5dba286acb3d558
SHA1

986d6f1d51bd54d1d2896598f21e6df9e9f3e7c1
SHA256

5f7135255973d195ec7374b7b3153fc5e39cedfc57c688bb91837ae13da7a1e4
SHA512

5859425504fee526a03d54ce499cea004fb8b110d0ec33447ebeda244213daf567d9eddb59d7937cd85b316ff26f94d71d8186715b0d54b60e38581c5b183982
SSDEEP

192:tf0NKYNJiLFeqeJHOHlGbakhujJRrms8N3vQ0aj1mvhCAjk2+QnLIP7F1qGDnJlL:lAvNsLEqeJOFOakhkJRrms8N3vQ0aj1z

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\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
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\Local Settings\Software\Microsoft\Windows\Shell\MuiCache	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	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
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

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

AcroRd32.exe

pid process

1732 AcroRd32.exe
1732 AcroRd32.exe
1732 AcroRd32.exe

pid	process
1732	AcroRd32.exe
1732	AcroRd32.exe
1732	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

cmd.exerundll32.exe

description	pid	process	target process
PID 1160 wrote to memory of 616	1160	cmd.exe	rundll32.exe
PID 1160 wrote to memory of 616	1160	cmd.exe	rundll32.exe
PID 1160 wrote to memory of 616	1160	cmd.exe	rundll32.exe
PID 616 wrote to memory of 1732	616	rundll32.exe	AcroRd32.exe
PID 616 wrote to memory of 1732	616	rundll32.exe	AcroRd32.exe
PID 616 wrote to memory of 1732	616	rundll32.exe	AcroRd32.exe
PID 616 wrote to memory of 1732	616	rundll32.exe	AcroRd32.exe

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\_weakrefset.pyc
1⤵
- Suspicious use of WriteProcessMemory
PID:1160

C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\_weakrefset.pyc
2⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:616

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\_weakrefset.pyc"
3⤵
- Suspicious use of SetWindowsHookEx
PID:1732

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/616-76-0x0000000000000000-mapping.dmp

Download
memory/1160-54-0x000007FEFBB21000-0x000007FEFBB23000-memory.dmp

Filesize
8KB

Download
memory/1732-81-0x0000000000000000-mapping.dmp

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memory/1732-82-0x0000000075A91000-0x0000000075A93000-memory.dmp

Filesize
8KB

Download