ca74d371515ec859319c06c21607ec1864ff5a2197745a7b7c17d7ca082a3243

General

Target

2024-05-25_c38b60dc32d8fcd469456ab13d8d81f7_cryptolocker.exe
Size

40KB
MD5

c38b60dc32d8fcd469456ab13d8d81f7
SHA1

e4a7478debe6448c97c4bf0f5f2ad94bc4237579
SHA256

ca74d371515ec859319c06c21607ec1864ff5a2197745a7b7c17d7ca082a3243
SHA512

53d0f8f0f2731af41bc398dc1e706dfa139a952182c4cee983787fe1e8cf1bbde52162b27884752d0f790924e577f510f19204b929c095dc452d90ddfe594b80
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITY91:qDdFJy3QMOtEvwDpjjWMl7T+

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/3856-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x00090000000235e3-13.dat	CryptoLocker_rule2
behavioral2/memory/3724-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3856-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3724-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/3856-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x00090000000235e3-13.dat	CryptoLocker_set1
behavioral2/memory/3724-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3856-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3724-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/3856-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x00090000000235e3-13.dat	UPX
behavioral2/memory/3724-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/3856-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/3724-27-0x0000000000500000-0x0000000000510000-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-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	2024-05-25_c38b60dc32d8fcd469456ab13d8d81f7_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
3724	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3856-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x00090000000235e3-13.dat	upx
behavioral2/memory/3724-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/3856-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/3724-27-0x0000000000500000-0x0000000000510000-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 3856 wrote to memory of 3724	3856	2024-05-25_c38b60dc32d8fcd469456ab13d8d81f7_cryptolocker.exe	90
PID 3856 wrote to memory of 3724	3856	2024-05-25_c38b60dc32d8fcd469456ab13d8d81f7_cryptolocker.exe	90
PID 3856 wrote to memory of 3724	3856	2024-05-25_c38b60dc32d8fcd469456ab13d8d81f7_cryptolocker.exe	90

C:\Users\Admin\AppData\Local\Temp\2024-05-25_c38b60dc32d8fcd469456ab13d8d81f7_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-25_c38b60dc32d8fcd469456ab13d8d81f7_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3856
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:3724

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=3756,i,13879737908471496610,15335851594401413307,262144 --variations-seed-version --mojo-platform-channel-handle=4296 /prefetch:8
1⤵
PID:2592

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
4793968d029aa0fa9bbc90e155a4e830

SHA1
200ab7a36d4234705d56bdd33b40953603dd4718

SHA256
c94e918ceb51724ef1499350690deab8b357f3c93e57359e5b3d92526afe0d0d

SHA512
fba583368f3c571046bdb40c38b5385cf011415768a37a1d7bf74e6ae84f27715828418d4b99088047000e9073009e769d0cb2e93009de189a64971f009f81a4

Download Submit
memory/3724-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3724-20-0x0000000000650000-0x0000000000656000-memory.dmp

Filesize
24KB

Download
memory/3724-26-0x0000000000630000-0x0000000000636000-memory.dmp

Filesize
24KB

Download
memory/3724-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3856-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3856-1-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/3856-2-0x00000000004F0000-0x00000000004F6000-memory.dmp

Filesize
24KB

Download
memory/3856-9-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/3856-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

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