jigsaw | 61cd0131cb4bf090c5ee7761566f6f7a778e78b37d220f0506f98632a2663ee8

Target

cats.exe
Size

126KB
MD5

e0d108435c58dc9403588e4dcab68275
SHA1

7a7331423938020550ff3decd2e8b50b3ee5c87a
SHA256

61cd0131cb4bf090c5ee7761566f6f7a778e78b37d220f0506f98632a2663ee8
SHA512

2a5648ced91b75d928b4d71a8580c5bee75a5f27623f8c5071cd23b8cd85eaa8129ddb0aaf0a1fcca05fb1b7868a0fcd9306e9ddf2d3eaaf605c41cc7fde4a9e

Score

10^/10

jigsaw persistence ransomware

Malware Config

Signatures

Jigsaw Ransomware
Ransomware family first created in 2016. Named based on wallpaper set after infection in the early versions.
ransomware jigsaw

Executes dropped EXE 1 IoCs

pid	Process
880	Chrome32.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\firefox.exe = "C:\\Users\\Admin\\AppData\\Roaming\\Frfx\\firefox.exe"	cats.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1640 wrote to memory of 880	1640	cats.exe	27
PID 1640 wrote to memory of 880	1640	cats.exe	27
PID 1640 wrote to memory of 880	1640	cats.exe	27

C:\Users\Admin\AppData\Local\Temp\cats.exe
"C:\Users\Admin\AppData\Local\Temp\cats.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1640
- C:\Users\Admin\AppData\Local\Google (x86)\Chrome32.exe
  "C:\Users\Admin\AppData\Local\Google (x86)\Chrome32.exe" C:\Users\Admin\AppData\Local\Temp\cats.exe
  2⤵
  - Executes dropped EXE
  PID:880

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/880-8-0x000007FEF5C60000-0x000007FEF65FD000-memory.dmp

Filesize
9.6MB

Download
memory/880-9-0x000007FEF5C60000-0x000007FEF65FD000-memory.dmp

Filesize
9.6MB

Download
memory/880-10-0x0000000000440000-0x0000000000442000-memory.dmp

Filesize
8KB

Download
memory/1640-2-0x000007FEF5C60000-0x000007FEF65FD000-memory.dmp

Filesize
9.6MB

Download
memory/1640-3-0x000007FEF5C60000-0x000007FEF65FD000-memory.dmp

Filesize
9.6MB

Download
memory/1640-4-0x0000000000A00000-0x0000000000A02000-memory.dmp

Filesize
8KB

Download

Resubmissions

Analysis

Sharing

General