b1db70ebb3a14b7d2c6f4caed2d7ae463204a57ec67d1376529559717c7d180d

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
28/05/2024, 02:28

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General

Target

2024-05-28_27a8c3fff4bb6c9fec14e5b32ce35b03_cryptolocker.exe
Size

60KB
MD5

27a8c3fff4bb6c9fec14e5b32ce35b03
SHA1

f7977a29c810288ae7599749d1cf1ea68b148420
SHA256

b1db70ebb3a14b7d2c6f4caed2d7ae463204a57ec67d1376529559717c7d180d
SHA512

9aabcffb87bdb3653648bffbfa8ffa2e1d2d8370f044044cebd13deafaf758bad823d4ef644959ac0243e6e7525f49dd62c84cd430e7541d24b02a239f25ae74
SSDEEP

768:H6LsoEEeegiZPvEhHSG+gk5NQXtckstOOtEvwDpjhBaD3TUogs/VXpAP6pU:H6QFElP6n+gou9cvMOtEvwDpjCpVXm

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/5084-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x0006000000023270-13.dat	CryptoLocker_rule2
behavioral2/memory/5084-16-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4820-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/5084-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x0006000000023270-13.dat	CryptoLocker_set1
behavioral2/memory/5084-16-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4820-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/5084-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x0006000000023270-13.dat	UPX
behavioral2/memory/5084-16-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4820-26-0x0000000000500000-0x0000000000510000-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-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	2024-05-28_27a8c3fff4bb6c9fec14e5b32ce35b03_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
4820	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/5084-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x0006000000023270-13.dat	upx
behavioral2/memory/5084-16-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4820-26-0x0000000000500000-0x0000000000510000-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 5084 wrote to memory of 4820	5084	2024-05-28_27a8c3fff4bb6c9fec14e5b32ce35b03_cryptolocker.exe	81
PID 5084 wrote to memory of 4820	5084	2024-05-28_27a8c3fff4bb6c9fec14e5b32ce35b03_cryptolocker.exe	81
PID 5084 wrote to memory of 4820	5084	2024-05-28_27a8c3fff4bb6c9fec14e5b32ce35b03_cryptolocker.exe	81

C:\Users\Admin\AppData\Local\Temp\2024-05-28_27a8c3fff4bb6c9fec14e5b32ce35b03_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-28_27a8c3fff4bb6c9fec14e5b32ce35b03_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5084
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:4820

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
60KB

MD5
d5b3487c67e97e30d586acf64c706cdf

SHA1
28eeb6cc8e5075b51bfe6686909891c37e10f322

SHA256
4244a030aab85fd5aa20213649ffa6afa8c846f6088e71b2a9a49220c2547b45

SHA512
3b59258e6a3fdc04f322820d6f33b42683744f3d70c2d5ee478070fbdcce6368a6c64d738b647282e08de79dcc7ee05247d8cd673311a40fad4cd1fab5c2dc0c

Download Submit
memory/4820-19-0x00000000020F0000-0x00000000020F6000-memory.dmp

Filesize
24KB

Download
memory/4820-25-0x0000000000660000-0x0000000000666000-memory.dmp

Filesize
24KB

Download
memory/4820-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/5084-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/5084-1-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/5084-2-0x00000000005C0000-0x00000000005C6000-memory.dmp

Filesize
24KB

Download
memory/5084-9-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/5084-16-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download