e97b5b67e2c089d0ef0a6c656c4b8fdc3a9d6fe7f322d5b77b0a028823c41ea4

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
19-04-2024 16:46

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General

Target

2024-04-19_856b48a2d9f98a0782a6298a1d39d9f8_cryptolocker.exe
Size

32KB
MD5

856b48a2d9f98a0782a6298a1d39d9f8
SHA1

e6c45b93291ec8543bef51cf43b3ea639605df3d
SHA256

e97b5b67e2c089d0ef0a6c656c4b8fdc3a9d6fe7f322d5b77b0a028823c41ea4
SHA512

29f90179b9ade0f5d81db464f55e327700c3ad626fa7c7d3ebac207711607e61c57cf9447ec9ed751d1e5441c3182e7423e8acb59db077b39b52505d49487fd2
SSDEEP

384:bM7Q0pjC4GybxMv01d3AcASBQMf6i/zzzcYgUPSznStEkcsVS:b/yC4GyNM01GuQMNXw2PSjSKkcqS

Score

9^/10

discovery

Malware Config

Signatures

Detection of CryptoLocker Variants 1 IoCs

resource	yara_rule
behavioral1/files/0x000b000000012707-10.dat	CryptoLocker_rule2

Executes dropped EXE 1 IoCs

pid	Process
2756	retln.exe

Loads dropped DLL 1 IoCs

pid	Process
2388	2024-04-19_856b48a2d9f98a0782a6298a1d39d9f8_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
2388	2024-04-19_856b48a2d9f98a0782a6298a1d39d9f8_cryptolocker.exe
2756	retln.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2388 wrote to memory of 2756	2388	2024-04-19_856b48a2d9f98a0782a6298a1d39d9f8_cryptolocker.exe	28
PID 2388 wrote to memory of 2756	2388	2024-04-19_856b48a2d9f98a0782a6298a1d39d9f8_cryptolocker.exe	28
PID 2388 wrote to memory of 2756	2388	2024-04-19_856b48a2d9f98a0782a6298a1d39d9f8_cryptolocker.exe	28
PID 2388 wrote to memory of 2756	2388	2024-04-19_856b48a2d9f98a0782a6298a1d39d9f8_cryptolocker.exe	28

C:\Users\Admin\AppData\Local\Temp\2024-04-19_856b48a2d9f98a0782a6298a1d39d9f8_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-19_856b48a2d9f98a0782a6298a1d39d9f8_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:2388
- 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:2756

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
32KB

MD5
b5ba9e3f16bfcecf9d4767cf1120c559

SHA1
3c37b7c542d94f925c7848b54a8e8d899d709f7f

SHA256
ec046197edf78fb6802917e1237ab890a8dc159d51b15baa00e5ec698b7ec334

SHA512
f8f547981d0ef0da43c689db5e41d4a1870f26809f4d8496e96eba490d72b8a0b18c9e98b0cf6381a600aefe3bd26f3bf0ef70aa675bb829a0301dcf9d248038

Download Submit
memory/2388-0-0x00000000003E0000-0x00000000003E6000-memory.dmp

Filesize
24KB

Download
memory/2388-1-0x0000000000400000-0x0000000000406000-memory.dmp

Filesize
24KB

Download
memory/2388-8-0x00000000003E0000-0x00000000003E6000-memory.dmp

Filesize
24KB

Download
memory/2756-23-0x0000000000300000-0x0000000000306000-memory.dmp

Filesize
24KB

Download