cryptolocker | 4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a

General

Target

4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a.exe
Size

306KB
MD5

c3e44673beef5ea9729f961ae675970a
SHA1

9a123902896be80475be8bd360f5449ae800f358
SHA256

4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a
SHA512

10fb7d2ea7909b8a062fb1e50b02f3cdd4d7227061ccb0cbc20c05556d121c2814406a836454f094329f33e084c00ceb72c9981e34c334d36c5a16c8ab60de13

Score

10^/10

cryptolocker persistence ransomware suricata upx

Malware Config

Signatures

CryptoLocker
Ransomware family with multiple variants.
ransomware cryptolocker
suricata: ET MALWARE Possible Zeus GameOver/FluBot Related DGA NXDOMAIN Responses
suricata: ET MALWARE Possible Zeus GameOver/FluBot Related DGA NXDOMAIN Responses
suricata

Executes dropped EXE 2 IoCs

pid	Process
1372	{34184A33-0407-212E-3320-09040709E2C2}.exe
2360	{34184A33-0407-212E-3320-09040709E2C2}.exe

UPX packed file 7 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/4688-130-0x0000000000350000-0x00000000003AD000-memory.dmp	upx
behavioral2/files/0x000b000000000038-133.dat	upx
behavioral2/files/0x000b000000000038-132.dat	upx
behavioral2/files/0x000b000000000038-135.dat	upx
behavioral2/memory/4688-136-0x0000000000350000-0x00000000003AD000-memory.dmp	upx
behavioral2/memory/1372-137-0x00000000005E0000-0x000000000063D000-memory.dmp	upx
behavioral2/memory/2360-138-0x00000000005E0000-0x000000000063D000-memory.dmp	upx

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\CryptoLocker = "C:\\Users\\Admin\\AppData\\Roaming\\{34184A33-0407-212E-3320-09040709E2C2}.exe"	{34184A33-0407-212E-3320-09040709E2C2}.exe
Key created	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Software\Microsoft\Windows\CurrentVersion\Run	{34184A33-0407-212E-3320-09040709E2C2}.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4688 wrote to memory of 1372	4688	4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a.exe	81
PID 4688 wrote to memory of 1372	4688	4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a.exe	81
PID 4688 wrote to memory of 1372	4688	4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a.exe	81
PID 1372 wrote to memory of 2360	1372	{34184A33-0407-212E-3320-09040709E2C2}.exe	82
PID 1372 wrote to memory of 2360	1372	{34184A33-0407-212E-3320-09040709E2C2}.exe	82
PID 1372 wrote to memory of 2360	1372	{34184A33-0407-212E-3320-09040709E2C2}.exe	82

C:\Users\Admin\AppData\Local\Temp\4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a.exe
"C:\Users\Admin\AppData\Local\Temp\4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4688
- C:\Users\Admin\AppData\Roaming\{34184A33-0407-212E-3320-09040709E2C2}.exe
  "C:\Users\Admin\AppData\Roaming\{34184A33-0407-212E-3320-09040709E2C2}.exe" "/rC:\Users\Admin\AppData\Local\Temp\4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:1372
- - C:\Users\Admin\AppData\Roaming\{34184A33-0407-212E-3320-09040709E2C2}.exe
    "C:\Users\Admin\AppData\Roaming\{34184A33-0407-212E-3320-09040709E2C2}.exe" /w0000021C
    3⤵
    - Executes dropped EXE
    PID:2360

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\{34184A33-0407-212E-3320-09040709E2C2}.exe

Filesize
306KB

MD5
c3e44673beef5ea9729f961ae675970a

SHA1
9a123902896be80475be8bd360f5449ae800f358

SHA256
4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a

SHA512
10fb7d2ea7909b8a062fb1e50b02f3cdd4d7227061ccb0cbc20c05556d121c2814406a836454f094329f33e084c00ceb72c9981e34c334d36c5a16c8ab60de13

Download Submit
C:\Users\Admin\AppData\Roaming\{34184A33-0407-212E-3320-09040709E2C2}.exe

Filesize
306KB

MD5
c3e44673beef5ea9729f961ae675970a

SHA1
9a123902896be80475be8bd360f5449ae800f358

SHA256
4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a

SHA512
10fb7d2ea7909b8a062fb1e50b02f3cdd4d7227061ccb0cbc20c05556d121c2814406a836454f094329f33e084c00ceb72c9981e34c334d36c5a16c8ab60de13

Download Submit
C:\Users\Admin\AppData\Roaming\{34184A33-0407-212E-3320-09040709E2C2}.exe

Filesize
306KB

MD5
c3e44673beef5ea9729f961ae675970a

SHA1
9a123902896be80475be8bd360f5449ae800f358

SHA256
4c4836b640c5c0b9150cd19747ebc1ae94793788721df2f4392544ac281bc91a

SHA512
10fb7d2ea7909b8a062fb1e50b02f3cdd4d7227061ccb0cbc20c05556d121c2814406a836454f094329f33e084c00ceb72c9981e34c334d36c5a16c8ab60de13

Download Submit
memory/1372-137-0x00000000005E0000-0x000000000063D000-memory.dmp

Filesize
372KB

Download
memory/2360-138-0x00000000005E0000-0x000000000063D000-memory.dmp

Filesize
372KB

Download
memory/4688-130-0x0000000000350000-0x00000000003AD000-memory.dmp

Filesize
372KB

Download
memory/4688-136-0x0000000000350000-0x00000000003AD000-memory.dmp

Filesize
372KB

Download

Analysis

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