a2aabf7711d7aba4d7c3f9b05ca12c07c14dd6892d6411417c9c2c2b164c20b6

General

Target

2024-05-23_3f5054310bb125153493feedd28ce434_cryptolocker.exe
Size

39KB
MD5

3f5054310bb125153493feedd28ce434
SHA1

210dfa43d6d824dc6d3958ca99e89e284a717320
SHA256

a2aabf7711d7aba4d7c3f9b05ca12c07c14dd6892d6411417c9c2c2b164c20b6
SHA512

3e5670df1aa009c334adb21e24a86cbdd30f4c50a6ea0d00afe124bca1b5309a699cc1bd4aec171061404ec3b0ed3d55b999b78bb28d46d20aecd5ffbbb559d7
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYaBE:qDdFJy3QMOtEvwDpjjWMl7Td+

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/1108-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000900000002354f-13.dat	CryptoLocker_rule2
behavioral2/memory/4404-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1108-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4404-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/1108-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x000900000002354f-13.dat	CryptoLocker_set1
behavioral2/memory/4404-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1108-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4404-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/1108-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x000900000002354f-13.dat	UPX
behavioral2/memory/4404-19-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/1108-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4404-28-0x0000000000500000-0x0000000000510000-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	2024-05-23_3f5054310bb125153493feedd28ce434_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
4404	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1108-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x000900000002354f-13.dat	upx
behavioral2/memory/4404-19-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/1108-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4404-28-0x0000000000500000-0x0000000000510000-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 1108 wrote to memory of 4404	1108	2024-05-23_3f5054310bb125153493feedd28ce434_cryptolocker.exe	90
PID 1108 wrote to memory of 4404	1108	2024-05-23_3f5054310bb125153493feedd28ce434_cryptolocker.exe	90
PID 1108 wrote to memory of 4404	1108	2024-05-23_3f5054310bb125153493feedd28ce434_cryptolocker.exe	90

C:\Users\Admin\AppData\Local\Temp\2024-05-23_3f5054310bb125153493feedd28ce434_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-23_3f5054310bb125153493feedd28ce434_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1108
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:4404

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=4356,i,5047420736443372512,9747851268033796534,262144 --variations-seed-version --mojo-platform-channel-handle=4292 /prefetch:8
1⤵
PID:1132

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
40KB

MD5
181ccc5b472acdb3a295257e08d5d3d3

SHA1
dd1c042b3dee9de985bb275527ac751541b3aca1

SHA256
1b79cbe16b12957fa6964120d74c236466354366e1b361dbd2a9478cc8addbb7

SHA512
c48e62574a11252b7944e7bacb54bf46e4300488ce16274af4ed0b07d1568e0ee6557a7b3830a10110dd522678967ffd8a67ece331bddb198dd8a7f92957b485

Download Submit
memory/1108-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1108-1-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/1108-2-0x00000000006C0000-0x00000000006C6000-memory.dmp

Filesize
24KB

Download
memory/1108-9-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/1108-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4404-19-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4404-21-0x0000000000690000-0x0000000000696000-memory.dmp

Filesize
24KB

Download
memory/4404-27-0x0000000000660000-0x0000000000666000-memory.dmp

Filesize
24KB

Download
memory/4404-28-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

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