913871ba5fad7d26f893199ed3faeef21a1462f3832d2fd76570f7e38371dc39

Analysis

max time kernel
13s
max time network
120s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
04-05-2024 04:26

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General

Target

2024-05-04_1bfa0baf418b409b7a57301e658d7912_cryptolocker.exe
Size

38KB
MD5

1bfa0baf418b409b7a57301e658d7912
SHA1

f15573426b8c4d2fc543b7d94e621132b2d5a492
SHA256

913871ba5fad7d26f893199ed3faeef21a1462f3832d2fd76570f7e38371dc39
SHA512

f808a02602bef432ae5d49379072df477bc980cc9dd056ddf1bcc563f86d47e666d1b8348c64176a77ef87059103733f34d6d71d00ccd9b00a959d46dd36c0da
SSDEEP

384:bM7Q0pjC4GybxMv01d3AcASBQMf6i/zzzcYgUPSzn1KkZCb9q8IujdxNX7Brs:b/yC4GyNM01GuQMNXw2PSj1Pqq8BPrs

Score

9^/10

discovery

Malware Config

Signatures

Detection of CryptoLocker Variants 1 IoCs

resource	yara_rule
behavioral1/files/0x000d00000001231a-10.dat	CryptoLocker_rule2

Executes dropped EXE 1 IoCs

pid	Process
2984	retln.exe

Loads dropped DLL 1 IoCs

pid	Process
2120	2024-05-04_1bfa0baf418b409b7a57301e658d7912_cryptolocker.exe

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
2120	2024-05-04_1bfa0baf418b409b7a57301e658d7912_cryptolocker.exe
2984	retln.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2120 wrote to memory of 2984	2120	2024-05-04_1bfa0baf418b409b7a57301e658d7912_cryptolocker.exe	28
PID 2120 wrote to memory of 2984	2120	2024-05-04_1bfa0baf418b409b7a57301e658d7912_cryptolocker.exe	28
PID 2120 wrote to memory of 2984	2120	2024-05-04_1bfa0baf418b409b7a57301e658d7912_cryptolocker.exe	28
PID 2120 wrote to memory of 2984	2120	2024-05-04_1bfa0baf418b409b7a57301e658d7912_cryptolocker.exe	28

C:\Users\Admin\AppData\Local\Temp\2024-05-04_1bfa0baf418b409b7a57301e658d7912_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-04_1bfa0baf418b409b7a57301e658d7912_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:2120
- 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:2984

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

Replay Monitor

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Downloads

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

Filesize
39KB

MD5
10842317e4a2b74fd6c87fda60dcb221

SHA1
94bc948fbc104fd73078d97d7f72142d5976b824

SHA256
82d04ac4886e84dff8b7ede745dd4ea0c1583f58e5452686a166cff0de328198

SHA512
00ac896fd51bb93000ed30f98468f199f31c7ca2c2fbbae0b97e128600e68dc5c9883fcba3f3ff580dda5db65491684be111146d2a3de6d52fd8fd25ae1cd426

Download Submit
memory/2120-0-0x0000000000380000-0x0000000000386000-memory.dmp

Filesize
24KB

Download
memory/2120-8-0x0000000000380000-0x0000000000386000-memory.dmp

Filesize
24KB

Download
memory/2120-1-0x0000000000400000-0x0000000000406000-memory.dmp

Filesize
24KB

Download
memory/2984-23-0x0000000000350000-0x0000000000356000-memory.dmp

Filesize
24KB

Download