85e22e67189a257f8ecef2beecf11bf126f94a132e9156033bf31e7b4ff9b835

General

Target

2024-05-21_66a0777bd8f46ab75b6a9d335335db7c_cryptolocker.exe
Size

39KB
MD5

66a0777bd8f46ab75b6a9d335335db7c
SHA1

0118df92c53a8e8b434c5bff57b869a912bc21f7
SHA256

85e22e67189a257f8ecef2beecf11bf126f94a132e9156033bf31e7b4ff9b835
SHA512

a2a6b06cfecdd70c4bc04bcc9dd551b55dc5da00ced39219922cc5ff53cf7e250540e91477096800436e2c28f04868541cd2a13e4a3143e2e04d5c156f0a6436
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYaBsWr:qDdFJy3QMOtEvwDpjjWMl7TdTr

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/2172-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x0009000000023553-13.dat	CryptoLocker_rule2
behavioral2/memory/2172-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2680-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2680-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/2172-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x0009000000023553-13.dat	CryptoLocker_set1
behavioral2/memory/2172-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2680-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2680-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/2172-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x0009000000023553-13.dat	UPX
behavioral2/memory/2172-19-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2680-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2680-28-0x0000000000500000-0x0000000000510000-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-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	2024-05-21_66a0777bd8f46ab75b6a9d335335db7c_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
2680	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2172-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x0009000000023553-13.dat	upx
behavioral2/memory/2172-19-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2680-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2680-28-0x0000000000500000-0x0000000000510000-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 2172 wrote to memory of 2680	2172	2024-05-21_66a0777bd8f46ab75b6a9d335335db7c_cryptolocker.exe	90
PID 2172 wrote to memory of 2680	2172	2024-05-21_66a0777bd8f46ab75b6a9d335335db7c_cryptolocker.exe	90
PID 2172 wrote to memory of 2680	2172	2024-05-21_66a0777bd8f46ab75b6a9d335335db7c_cryptolocker.exe	90

C:\Users\Admin\AppData\Local\Temp\2024-05-21_66a0777bd8f46ab75b6a9d335335db7c_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-21_66a0777bd8f46ab75b6a9d335335db7c_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2172
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:2680

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 --field-trial-handle=4436,i,7012731823941922179,12386606396608877869,262144 --variations-seed-version --mojo-platform-channel-handle=4348 /prefetch:8
1⤵
PID:4924

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

Loading Replay Monitor...

Downloads

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

Filesize
39KB

MD5
513c1557104265a729ed315cfc95482a

SHA1
b04ec1d1b0b5c6dec85ddb5a616cd6e1282f7ced

SHA256
940e30cd86efc063357e665e9925d6fc6814dd277f0fe2eff4f87f70cb084a35

SHA512
e5662c607bf601769bf1a170eccf43b669d1259361d2af791554eae3ae320771b245170317a02edf4fcf05268ee11d317c34ea2ab9d58ee73dc46704d3d1cc90

Download Submit
memory/2172-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2172-1-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/2172-2-0x00000000007D0000-0x00000000007D6000-memory.dmp

Filesize
24KB

Download
memory/2172-9-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/2172-19-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2680-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2680-21-0x00000000005E0000-0x00000000005E6000-memory.dmp

Filesize
24KB

Download
memory/2680-27-0x00000000005C0000-0x00000000005C6000-memory.dmp

Filesize
24KB

Download
memory/2680-28-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing