87df76e890933c81748298b443f6bc81bdcc37c46d13d53f7c8f27fed682da48

Analysis

max time kernel
148s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
10/03/2024, 16:29

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General

Target

2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe
Size

62KB
MD5

71631bd4df6e8882695f1b8f8233fb71
SHA1

761b85bb5d012701da3bdfd28942513a9e401aff
SHA256

87df76e890933c81748298b443f6bc81bdcc37c46d13d53f7c8f27fed682da48
SHA512

15230aef1f23254bc4253c5511bec417e459e3b6d2b3f4791792b79348c715216f60f6d361ffd6b194c662802944684e1d74adfb050cbc4cdb937edb09b79980
SSDEEP

1536:qmbhXDmjr5MOtEvwDpj5cDtKkQZQRKb61vSbgtstY:BbdDmjr+OtEvwDpjM8W

Score

9^/10

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/4640-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000700000001ebc7-13.dat	CryptoLocker_rule2
behavioral2/memory/4640-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/756-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/756-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 2 IoCs

resource	yara_rule
behavioral2/memory/4640-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/756-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/4640-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x000700000001ebc7-13.dat	UPX
behavioral2/memory/4640-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/756-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/756-27-0x0000000000500000-0x0000000000510000-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-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
756	asih.exe

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 4640 wrote to memory of 756	4640	2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe	88
PID 4640 wrote to memory of 756	4640	2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe	88
PID 4640 wrote to memory of 756	4640	2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe	88

C:\Users\Admin\AppData\Local\Temp\2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4640
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:756

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
62KB

MD5
ce7d8e63150488b8885357fdc432493a

SHA1
08f7d164082f02b7dbd69d5b8a18da8090d0262b

SHA256
741f1f80ba1daa314fc4099972e7eae4af12a8a7743d9b03aadf5409c169d85d

SHA512
6bee0af6d4adc31f42ef566d51a9949fe401faefcc62dd18a4f33991718b2b32d2089cfc5337f8daf1c69524f356bba409c71d7b79e219369e199f12242ea5e4

Download Submit
memory/756-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/756-20-0x0000000001FE0000-0x0000000001FE6000-memory.dmp

Filesize
24KB

Download
memory/756-22-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/756-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4640-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4640-2-0x0000000000520000-0x0000000000526000-memory.dmp

Filesize
24KB

Download
memory/4640-1-0x0000000000520000-0x0000000000526000-memory.dmp

Filesize
24KB

Download
memory/4640-3-0x0000000002060000-0x0000000002066000-memory.dmp

Filesize
24KB

Download
memory/4640-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download