c735e44f751a6658645bed3a587503f4fb2d9343eb7d5637e5334dccfc37b672

Analysis

max time kernel
15s
max time network
122s
platform
windows7_x64
resource
win7-20240215-en
resource tags

arch:x64arch:x86image:win7-20240215-enlocale:en-usos:windows7-x64system
submitted
19/04/2024, 04:31

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General

Target

2024-04-19_cf623d696e7623d88bf50fcc5863267d_cryptolocker.exe
Size

42KB
MD5

cf623d696e7623d88bf50fcc5863267d
SHA1

7bc5cc5ebb1ec8265b77b4ec9dc216e7169302ff
SHA256

c735e44f751a6658645bed3a587503f4fb2d9343eb7d5637e5334dccfc37b672
SHA512

edf539546e2f9529b1c2ef2e056dad53fcd9fe2ffcbfebe40a6c2a37cc9ab0268e23b336db1fb2a0cd291bef812bc305570f227e40a6c8e1b9ab142e6d03ed74
SSDEEP

768:b/yC4GyNM01GuQMNXw2PSjHPbSuYlW8PA0:b/pYayGig5HjS3NPA0

Score

9^/10

discovery

Malware Config

Signatures

Detection of CryptoLocker Variants 1 IoCs

resource	yara_rule
behavioral1/files/0x000a000000012252-10.dat	CryptoLocker_rule2

Executes dropped EXE 1 IoCs

pid	Process
2056	retln.exe

Loads dropped DLL 1 IoCs

pid	Process
1876	2024-04-19_cf623d696e7623d88bf50fcc5863267d_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
1876	2024-04-19_cf623d696e7623d88bf50fcc5863267d_cryptolocker.exe
2056	retln.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1876 wrote to memory of 2056	1876	2024-04-19_cf623d696e7623d88bf50fcc5863267d_cryptolocker.exe	28
PID 1876 wrote to memory of 2056	1876	2024-04-19_cf623d696e7623d88bf50fcc5863267d_cryptolocker.exe	28
PID 1876 wrote to memory of 2056	1876	2024-04-19_cf623d696e7623d88bf50fcc5863267d_cryptolocker.exe	28
PID 1876 wrote to memory of 2056	1876	2024-04-19_cf623d696e7623d88bf50fcc5863267d_cryptolocker.exe	28

C:\Users\Admin\AppData\Local\Temp\2024-04-19_cf623d696e7623d88bf50fcc5863267d_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-19_cf623d696e7623d88bf50fcc5863267d_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:1876
- 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:2056

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
42KB

MD5
44c7d803e9b793877b14196ea75c67c0

SHA1
7a35036bae6cb1fa5ed8d2d3653d7a8ef263dda7

SHA256
9a5db425e91382367431297c731396a00ab8a7144d4f18d6446cffeb0aa347d2

SHA512
fbb78a69c291c6b592adcea82788b38f1a3d1c0e4161df913b719b7029a08f072e1df05f752703be56ea34da1edd18b85ebe33f3161788f2772ff3fc23012e54

Download Submit
memory/1876-0-0x00000000004B0000-0x00000000004B6000-memory.dmp

Filesize
24KB

Download
memory/1876-1-0x0000000000400000-0x0000000000406000-memory.dmp

Filesize
24KB

Download
memory/1876-8-0x00000000004B0000-0x00000000004B6000-memory.dmp

Filesize
24KB

Download
memory/2056-17-0x0000000001BC0000-0x0000000001BC6000-memory.dmp

Filesize
24KB

Download