d76b4538a0bbdfe108fa3e990951c12ea4417cf6dcab34deb616cf876f6f948d

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
28/03/2024, 09:51

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General

Target

2024-03-28_a27fdeb6e5b2afa55c15e9fd3e4cc935_cryptolocker.exe
Size

35KB
MD5

a27fdeb6e5b2afa55c15e9fd3e4cc935
SHA1

b124c1f797e9311b492a5165db64d1976c0a0eaa
SHA256

d76b4538a0bbdfe108fa3e990951c12ea4417cf6dcab34deb616cf876f6f948d
SHA512

210b7b22b648c5ecd79975ce8b43df793d6ebeb8cdeaf732f96a75a039b9de928cd170783c48ca190c7794567e8f8b2bcf8c7a5a2375882213119152cf85c08e
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkMRm:qDdFJy3QMOtEvwDpjjWMl3Rm

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/988-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x00090000000226e5-13.dat	CryptoLocker_rule2
behavioral2/memory/988-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3052-25-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/988-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x00090000000226e5-13.dat	CryptoLocker_set1
behavioral2/memory/988-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3052-25-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/988-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x00090000000226e5-13.dat	UPX
behavioral2/memory/988-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/3052-25-0x0000000000500000-0x0000000000510000-memory.dmp	UPX

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	2024-03-28_a27fdeb6e5b2afa55c15e9fd3e4cc935_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
3052	asih.exe

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/988-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x00090000000226e5-13.dat	upx
behavioral2/memory/988-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/3052-25-0x0000000000500000-0x0000000000510000-memory.dmp	upx

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 988 wrote to memory of 3052	988	2024-03-28_a27fdeb6e5b2afa55c15e9fd3e4cc935_cryptolocker.exe	87
PID 988 wrote to memory of 3052	988	2024-03-28_a27fdeb6e5b2afa55c15e9fd3e4cc935_cryptolocker.exe	87
PID 988 wrote to memory of 3052	988	2024-03-28_a27fdeb6e5b2afa55c15e9fd3e4cc935_cryptolocker.exe	87

C:\Users\Admin\AppData\Local\Temp\2024-03-28_a27fdeb6e5b2afa55c15e9fd3e4cc935_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-03-28_a27fdeb6e5b2afa55c15e9fd3e4cc935_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:988
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:3052

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe

Filesize
36KB

MD5
c6f49a1b97bcda7ad644b7b05246bb3f

SHA1
aa1fb438bd584480b13b218f382b4134332b584e

SHA256
cdaa0b9f2a480b6493e18a17a3adc522bb5c04a560e8df1d896ebc0c5a0edbcd

SHA512
b83e8a31a5f1b6e7e5a2234379b881dbd4c5283ba34edf79189f5c80011722e3544e6e1620d3339ae99b5fe1b625e1c7d990fc5e7e2b784340c8459c5037dd0c

Download Submit
memory/988-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/988-1-0x0000000000550000-0x0000000000556000-memory.dmp

Filesize
24KB

Download
memory/988-2-0x0000000000550000-0x0000000000556000-memory.dmp

Filesize
24KB

Download
memory/988-3-0x0000000000570000-0x0000000000576000-memory.dmp

Filesize
24KB

Download
memory/988-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3052-25-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download