5387cc193ecbd9a76163d9281cefd716005d9e1677dce504815b91e2692792c5

Analysis

max time kernel
122s
max time network
122s
platform
windows7_x64
resource
win7-20240611-en
resource tags

arch:x64arch:x86image:win7-20240611-enlocale:en-usos:windows7-x64system
submitted
12/06/2024, 11:25

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General

Target

2024-06-12_022e872535aa9e63cc3581ab61ec70d2_cryptolocker.exe
Size

25KB
MD5

022e872535aa9e63cc3581ab61ec70d2
SHA1

afcff7274f5a022e2783afa9ce3d9c7c57f16fd1
SHA256

5387cc193ecbd9a76163d9281cefd716005d9e1677dce504815b91e2692792c5
SHA512

0603ae671c75bf4c90e51227666b178dd03d4a01c88fe001f83b2e0415e74bc1853316b2fc22c1e9d2c304dc2b5dd52742dce28bdf8e20ffa4cc64860bfb1efa
SSDEEP

384:bCj4PdKCpD2jXUrMkeaNJawcudoD7Uh/zzRsTE:bYOdVB2jXUrMkvnbcuyD7UFXOo

Score

9^/10

discovery upx

Malware Config

Signatures

Detection of CryptoLocker Variants 3 IoCs

resource	yara_rule
behavioral1/memory/2296-0-0x0000000000400000-0x000000000040E000-memory.dmp	CryptoLocker_rule2
behavioral1/files/0x000f000000012324-11.dat	CryptoLocker_rule2
behavioral1/memory/2324-15-0x0000000000400000-0x000000000040E000-memory.dmp	CryptoLocker_rule2

UPX dump on OEP (original entry point) 3 IoCs

resource	yara_rule
behavioral1/memory/2296-0-0x0000000000400000-0x000000000040E000-memory.dmp	UPX
behavioral1/files/0x000f000000012324-11.dat	UPX
behavioral1/memory/2324-15-0x0000000000400000-0x000000000040E000-memory.dmp	UPX

Executes dropped EXE 1 IoCs

pid	Process
2324	retln.exe

Loads dropped DLL 1 IoCs

pid	Process
2296	2024-06-12_022e872535aa9e63cc3581ab61ec70d2_cryptolocker.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2296-0-0x0000000000400000-0x000000000040E000-memory.dmp	upx
behavioral1/files/0x000f000000012324-11.dat	upx
behavioral1/memory/2324-15-0x0000000000400000-0x000000000040E000-memory.dmp	upx

Creates a large amount of network flows 1 TTPs
This may indicate a network scan to discover remotely running services.
discovery

Network Service Discovery
T1046
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

pid	Process
2296	2024-06-12_022e872535aa9e63cc3581ab61ec70d2_cryptolocker.exe
2324	retln.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2296 wrote to memory of 2324	2296	2024-06-12_022e872535aa9e63cc3581ab61ec70d2_cryptolocker.exe	28
PID 2296 wrote to memory of 2324	2296	2024-06-12_022e872535aa9e63cc3581ab61ec70d2_cryptolocker.exe	28
PID 2296 wrote to memory of 2324	2296	2024-06-12_022e872535aa9e63cc3581ab61ec70d2_cryptolocker.exe	28
PID 2296 wrote to memory of 2324	2296	2024-06-12_022e872535aa9e63cc3581ab61ec70d2_cryptolocker.exe	28

C:\Users\Admin\AppData\Local\Temp\2024-06-12_022e872535aa9e63cc3581ab61ec70d2_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-06-12_022e872535aa9e63cc3581ab61ec70d2_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:2296
- C:\Users\Admin\AppData\Local\Temp\retln.exe
  "C:\Users\Admin\AppData\Local\Temp\retln.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of UnmapMainImage
  PID:2324

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Network Service Discovery

T1046

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
25KB

MD5
0b90d93ff9b0110f69836448a6e7dad8

SHA1
48f8879c1c511a263d52b80cfa4958adbc3af91c

SHA256
6546aae8c38bf3ba8f3af18444611cdcef4426463e7e54b87419926085e2b763

SHA512
fa2da8cf7dd3b470282d41a7c718a38295874badd4c24f9891c414b692517bd23eda415c1dd45aecb3b580bdb71ed7db373ebf41af16d67b731fd6bb6fae14ab

Download Submit
memory/2296-0-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2296-2-0x00000000003B0000-0x00000000003B6000-memory.dmp

Filesize
24KB

Download
memory/2296-3-0x0000000000400000-0x0000000000406000-memory.dmp

Filesize
24KB

Download
memory/2296-1-0x00000000003B0000-0x00000000003B6000-memory.dmp

Filesize
24KB

Download
memory/2324-15-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2324-24-0x00000000003C0000-0x00000000003C6000-memory.dmp

Filesize
24KB

Download