81048f3debdf218a9ed56bc551831deada130b8b90ff090007927a9e410a1bbb

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240220-en
resource tags

arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
submitted
24-05-2024 04:27

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General

Target

2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe
Size

55KB
MD5

4424078f1e0e8e88db235c9cf283ef74
SHA1

a9b43024c8096b54e6c828fab746dfc20a6dde6d
SHA256

81048f3debdf218a9ed56bc551831deada130b8b90ff090007927a9e410a1bbb
SHA512

b9969682bca98a5264075a30104e7e7f1f46746a111bfa98b3b13962f9a458a51727cf9453acba9782518105a794cd9a84bf4f647bca53515fc378e617a82e36
SSDEEP

768:bP9g/WItCSsAfFaeOcfXVr3BPOz5CFBmNuFgUjlQ:bP9g/xtCS3Dxx0b

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2908-0-0x0000000000400000-0x000000000040E000-memory.dmp	CryptoLocker_rule2
\Users\Admin\AppData\Local\Temp\gewos.exe	CryptoLocker_rule2
behavioral1/memory/2908-13-0x0000000001F50000-0x0000000001F5E000-memory.dmp	CryptoLocker_rule2
behavioral1/memory/2508-18-0x0000000000400000-0x000000000040E000-memory.dmp	CryptoLocker_rule2

UPX dump on OEP (original entry point) 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2908-0-0x0000000000400000-0x000000000040E000-memory.dmp	UPX
\Users\Admin\AppData\Local\Temp\gewos.exe	UPX
behavioral1/memory/2908-13-0x0000000001F50000-0x0000000001F5E000-memory.dmp	UPX
behavioral1/memory/2508-18-0x0000000000400000-0x000000000040E000-memory.dmp	UPX

Executes dropped EXE 1 IoCs

Processes:

gewos.exe

pid process

2508 gewos.exe
Loads dropped DLL 1 IoCs

Processes:

2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe

pid process

2908 2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe

pid	process
2508	gewos.exe

pid	process
2908	2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe

UPX packed file 4 IoCs

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

upx

Processes:

resource	yara_rule
behavioral1/memory/2908-0-0x0000000000400000-0x000000000040E000-memory.dmp	upx
\Users\Admin\AppData\Local\Temp\gewos.exe	upx
behavioral1/memory/2908-13-0x0000000001F50000-0x0000000001F5E000-memory.dmp	upx
behavioral1/memory/2508-18-0x0000000000400000-0x000000000040E000-memory.dmp	upx

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

System Information Discovery
T1082
Suspicious use of UnmapMainImage 2 IoCs

Processes:

2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exegewos.exe

pid process

2908 2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe
2508 gewos.exe

pid	process
2908	2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe
2508	gewos.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe

description	pid	process	target process
PID 2908 wrote to memory of 2508	2908	2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe	gewos.exe
PID 2908 wrote to memory of 2508	2908	2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe	gewos.exe
PID 2908 wrote to memory of 2508	2908	2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe	gewos.exe
PID 2908 wrote to memory of 2508	2908	2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe	gewos.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-24_4424078f1e0e8e88db235c9cf283ef74_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:2908
- C:\Users\Admin\AppData\Local\Temp\gewos.exe
  "C:\Users\Admin\AppData\Local\Temp\gewos.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of UnmapMainImage
  PID:2508

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\gewos.exe

Filesize
56KB

MD5
fe467fd7979eb883a27ac8340a0a60de

SHA1
50176b369e513e30e4499b57f3fe745f87b947f7

SHA256
11ba6a37b4eccf5dfc3c0dae745077540b7ee8c1e5b47d5373fc45a34086e81b

SHA512
ac2ead0f4aa9a63c63c85bef43926fd40aa1a3aef69e6d87126898db52b806dcc9f0dc6f3047f78b35732d8f9b857cbf64980e857352953a27074cd73d379d93

Download Submit
memory/2508-18-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2508-26-0x0000000000290000-0x0000000000296000-memory.dmp

Filesize
24KB

Download
memory/2908-0-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2908-1-0x0000000000310000-0x0000000000316000-memory.dmp

Filesize
24KB

Download
memory/2908-2-0x0000000000400000-0x0000000000406000-memory.dmp

Filesize
24KB

Download
memory/2908-9-0x0000000000310000-0x0000000000316000-memory.dmp

Filesize
24KB

Download
memory/2908-13-0x0000000001F50000-0x0000000001F5E000-memory.dmp

Filesize
56KB

Download