16555abeea93184b67c327b234e7e6ae0ef8477f3313656f5e12961633fd9490

Analysis

max time kernel
11s
max time network
122s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
09/04/2024, 11:54

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General

Target

2024-04-09_fde5d58c541bcb6302e3049223c2cdf5_cryptolocker.exe
Size

39KB
MD5

fde5d58c541bcb6302e3049223c2cdf5
SHA1

e440819bf47beec086420f48b09c9a4fdeef7e2d
SHA256

16555abeea93184b67c327b234e7e6ae0ef8477f3313656f5e12961633fd9490
SHA512

61a00cfc9eff82e02250842fc7f4584681c4ba5aab6fa7179b303707416bd23ec034100261f3aa014f8c40afc1d98ef82d1bea3294391013ff692168132e1a29
SSDEEP

384:bM7Q0pjC4GybxMv01d3AcASBQMf6i/zzzcYgUPSznHzl6AJvDSuYlmoH8Nz:b/yC4GyNM01GuQMNXw2PSjHPbSuYlZcp

Score

9^/10

discovery

Malware Config

Signatures

Detection of CryptoLocker Variants 1 IoCs

resource	yara_rule
behavioral1/files/0x000900000001222c-10.dat	CryptoLocker_rule2

Executes dropped EXE 1 IoCs

pid	Process
2300	retln.exe

Loads dropped DLL 1 IoCs

pid	Process
1136	2024-04-09_fde5d58c541bcb6302e3049223c2cdf5_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
1136	2024-04-09_fde5d58c541bcb6302e3049223c2cdf5_cryptolocker.exe
2300	retln.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1136 wrote to memory of 2300	1136	2024-04-09_fde5d58c541bcb6302e3049223c2cdf5_cryptolocker.exe	28
PID 1136 wrote to memory of 2300	1136	2024-04-09_fde5d58c541bcb6302e3049223c2cdf5_cryptolocker.exe	28
PID 1136 wrote to memory of 2300	1136	2024-04-09_fde5d58c541bcb6302e3049223c2cdf5_cryptolocker.exe	28
PID 1136 wrote to memory of 2300	1136	2024-04-09_fde5d58c541bcb6302e3049223c2cdf5_cryptolocker.exe	28

C:\Users\Admin\AppData\Local\Temp\2024-04-09_fde5d58c541bcb6302e3049223c2cdf5_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-09_fde5d58c541bcb6302e3049223c2cdf5_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:1136
- 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:2300

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
40KB

MD5
5ea93a2e3b39890dbc83f3626db8221f

SHA1
c3f6d7235c13fea08b98422009c7505472d8285c

SHA256
c80bf7a3020a96260acc53e5bc9a127052e7af51c43160c5455f4555fc66967b

SHA512
e56f160e1030348d60d290e8d4868b1087f9e0d59a8b5fad2fc7fdd0a965d57e70e184ab66e6bb8cead726d8fc71dc42b08e7c6a647da8b5b69da95f14d9ff5c

Download Submit
memory/1136-0-0x0000000000270000-0x0000000000276000-memory.dmp

Filesize
24KB

Download
memory/1136-1-0x0000000000400000-0x0000000000406000-memory.dmp

Filesize
24KB

Download
memory/1136-3-0x0000000000270000-0x0000000000276000-memory.dmp

Filesize
24KB

Download
memory/2300-16-0x00000000002F0000-0x00000000002F6000-memory.dmp

Filesize
24KB

Download