6585aeffb7a6ac41185ef51d5f8d7c85cd0f0192890dbf983336e45637c71a1b

General

Target

2024-03-13_9b85f8bc07d45ce2d569bbfa6ae3837a_cryptolocker.exe
Size

57KB
MD5

9b85f8bc07d45ce2d569bbfa6ae3837a
SHA1

498f64b9aaf1172a3f5890f3f3164e5bddf95714
SHA256

6585aeffb7a6ac41185ef51d5f8d7c85cd0f0192890dbf983336e45637c71a1b
SHA512

a492e6c00a5158facc1be734d9886ac20fe84bcd3b33cd0bc098606d4e64a28c21e24cf4bad0fd52962f3abaea7d84e0d566a77ee51c231f53a9e4982ed43395
SSDEEP

768:z6LsoEEeegiZPvEhHSG+gzum/kLyMro2GtOOtEvwDpj/YMLam5ax8XilN97:z6QFElP6n+gKmddpMOtEvwDpj9aYaL/R

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/1440-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000800000001db2a-13.dat	CryptoLocker_rule2
behavioral2/memory/3796-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1440-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3796-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/1440-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x000800000001db2a-13.dat	CryptoLocker_set1
behavioral2/memory/3796-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1440-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3796-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/1440-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x000800000001db2a-13.dat	UPX
behavioral2/memory/3796-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/1440-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/3796-27-0x0000000000500000-0x0000000000510000-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-1-5-21-1904519900-954640453-4250331663-1000\Control Panel\International\Geo\Nation	2024-03-13_9b85f8bc07d45ce2d569bbfa6ae3837a_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
3796	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1440-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x000800000001db2a-13.dat	upx
behavioral2/memory/3796-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/1440-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/3796-27-0x0000000000500000-0x0000000000510000-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 1440 wrote to memory of 3796	1440	2024-03-13_9b85f8bc07d45ce2d569bbfa6ae3837a_cryptolocker.exe	97
PID 1440 wrote to memory of 3796	1440	2024-03-13_9b85f8bc07d45ce2d569bbfa6ae3837a_cryptolocker.exe	97
PID 1440 wrote to memory of 3796	1440	2024-03-13_9b85f8bc07d45ce2d569bbfa6ae3837a_cryptolocker.exe	97

C:\Users\Admin\AppData\Local\Temp\2024-03-13_9b85f8bc07d45ce2d569bbfa6ae3837a_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-03-13_9b85f8bc07d45ce2d569bbfa6ae3837a_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1440
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:3796

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3896 --field-trial-handle=2256,i,6057863739127169200,6895476048812676039,262144 --variations-seed-version /prefetch:8
1⤵
PID:4312

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

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
58KB

MD5
9bcf67835baffadbd41662c249504740

SHA1
b5a9a1aae8bc2a2681d74d3618e051706373d335

SHA256
5dab7667ce0d96a9f1a6971425843409f741aea7a6bad1cb2d695e1c04f35256

SHA512
272ace4b663c079149e70a159c66a10b4a1b0b5992ac38afe321fa57b2e82488e0dfa11f48c391a3465156b0debdcb2d62bd7bbd448170488a16dd4ae7a85c6f

Download Submit
memory/1440-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1440-1-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/1440-2-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/1440-3-0x0000000002240000-0x0000000002246000-memory.dmp

Filesize
24KB

Download
memory/1440-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3796-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3796-20-0x0000000001F70000-0x0000000001F76000-memory.dmp

Filesize
24KB

Download
memory/3796-23-0x0000000000840000-0x0000000000846000-memory.dmp

Filesize
24KB

Download
memory/3796-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

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