935def8136348cb3d809b13ac91907fa1c138f335ee66dfb231ca74dff564d00

Analysis

max time kernel
11s
max time network
150s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
15-05-2024 13:29

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General

Target

2024-05-15_863c83697a467db6361296e0f6900005_cryptolocker.exe
Size

34KB
MD5

863c83697a467db6361296e0f6900005
SHA1

ea9b449b7c5ffa3ca595a52b7b23269407662e2c
SHA256

935def8136348cb3d809b13ac91907fa1c138f335ee66dfb231ca74dff564d00
SHA512

d4eb62729c2003e30e23f96ec9d27bb4f87b4eabb1920580bcbd53cb9756a1ec1510a82c809ce1546156baac1b4ba378688737ce3834bb5978251096fb2beec2
SSDEEP

384:bM7Q0pjC4GybxMv01d3AcASBQMf6i/zzzcYgUPSznStEkcsgR54Nv9c:b/yC4GyNM01GuQMNXw2PSjSKkcJR549c

Score

9^/10

discovery

Malware Config

Signatures

Detection of CryptoLocker Variants 1 IoCs

resource	yara_rule
behavioral1/files/0x000d000000013a06-10.dat	CryptoLocker_rule2

Executes dropped EXE 1 IoCs

pid	Process
1624	retln.exe

Loads dropped DLL 1 IoCs

pid	Process
1948	2024-05-15_863c83697a467db6361296e0f6900005_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
1948	2024-05-15_863c83697a467db6361296e0f6900005_cryptolocker.exe
1624	retln.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1948 wrote to memory of 1624	1948	2024-05-15_863c83697a467db6361296e0f6900005_cryptolocker.exe	28
PID 1948 wrote to memory of 1624	1948	2024-05-15_863c83697a467db6361296e0f6900005_cryptolocker.exe	28
PID 1948 wrote to memory of 1624	1948	2024-05-15_863c83697a467db6361296e0f6900005_cryptolocker.exe	28
PID 1948 wrote to memory of 1624	1948	2024-05-15_863c83697a467db6361296e0f6900005_cryptolocker.exe	28

C:\Users\Admin\AppData\Local\Temp\2024-05-15_863c83697a467db6361296e0f6900005_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-15_863c83697a467db6361296e0f6900005_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:1948
- 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:1624

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
34KB

MD5
13fc71a9be2c653e5c048121d831e73c

SHA1
63539af2dbbed368fd401de5c413fe5ea63f1f8d

SHA256
91f250f77a6ea96aa034d6b80555bdc2b71a14fbb860c2f3128ead0d0ebccbc4

SHA512
4cf5546ed9194761758c9a7a02b9865b92975dee886e510037439aedba06341d77bc21bd7ad24741e5529445ca81112b92b7ea183bc61b7bab42587ce3579a05

Download Submit
memory/1624-23-0x0000000000290000-0x0000000000296000-memory.dmp

Filesize
24KB

Download
memory/1948-1-0x0000000000400000-0x0000000000406000-memory.dmp

Filesize
24KB

Download
memory/1948-0-0x00000000003C0000-0x00000000003C6000-memory.dmp

Filesize
24KB

Download
memory/1948-8-0x00000000003C0000-0x00000000003C6000-memory.dmp

Filesize
24KB

Download