23a787bc7b94ce82de9f8b6bb5322ea739512ffee717e7216121e0e7d7900105

Analysis

max time kernel
147s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
22-05-2024 22:32

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General

Target

2024-05-22_cb214613b51529f9f0367c8e7a8ea0dd_cryptolocker.exe
Size

91KB
MD5

cb214613b51529f9f0367c8e7a8ea0dd
SHA1

a91cc05f127b7d6dea2fe2e42c32b362df1d49f0
SHA256

23a787bc7b94ce82de9f8b6bb5322ea739512ffee717e7216121e0e7d7900105
SHA512

69e2d066e940e32e2255ead3d93fcfc906e3f46de5273a3cd9a624693ce66c094bada42606ded7e93868d428df7b28ff7978a6e7b97c22ecc71835016e79f62a
SSDEEP

1536:qkmnpomddpMOtEvwDpjJGYQbN/PKwMgddE:AnBdOOtEvwDpj6zA

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4780-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/4020-17-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4780-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4020-27-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4780-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/4020-17-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4780-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4020-27-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4780-0-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/4020-17-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/4780-18-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/4020-27-0x0000000000500000-0x000000000050F000-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

Processes:

2024-05-22_cb214613b51529f9f0367c8e7a8ea0dd_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation	2024-05-22_cb214613b51529f9f0367c8e7a8ea0dd_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

4020 asih.exe

pid	process
4020	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/4780-0-0x0000000000500000-0x000000000050F000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/4020-17-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/4780-18-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/4020-27-0x0000000000500000-0x000000000050F000-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

Processes:

2024-05-22_cb214613b51529f9f0367c8e7a8ea0dd_cryptolocker.exe

description	pid	process	target process
PID 4780 wrote to memory of 4020	4780	2024-05-22_cb214613b51529f9f0367c8e7a8ea0dd_cryptolocker.exe	asih.exe
PID 4780 wrote to memory of 4020	4780	2024-05-22_cb214613b51529f9f0367c8e7a8ea0dd_cryptolocker.exe	asih.exe
PID 4780 wrote to memory of 4020	4780	2024-05-22_cb214613b51529f9f0367c8e7a8ea0dd_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-22_cb214613b51529f9f0367c8e7a8ea0dd_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-22_cb214613b51529f9f0367c8e7a8ea0dd_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4780
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:4020

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
91KB

MD5
01c8346d14cc5b4b71e24d71a8332e8b

SHA1
7c450b99619de10053db8c3ded714965c8eeffc4

SHA256
208b745af23e79f3a19e1d25a173ff5405b0344033d2239aa06941bb02109bff

SHA512
49f098e3592935b95722b79c5e8d413e933bc9c8654bf3c9031e210d5657affbfd1a3e9c05892e56faee44c067506eb2759a30b92617a2702e394ba77d3f2b52

Download Submit
memory/4020-17-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/4020-26-0x00000000006B0000-0x00000000006B6000-memory.dmp

Filesize
24KB

Download
memory/4020-20-0x00000000006D0000-0x00000000006D6000-memory.dmp

Filesize
24KB

Download
memory/4020-27-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/4780-0-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/4780-1-0x00000000007B0000-0x00000000007B6000-memory.dmp

Filesize
24KB

Download
memory/4780-3-0x0000000002070000-0x0000000002076000-memory.dmp

Filesize
24KB

Download
memory/4780-9-0x00000000007B0000-0x00000000007B6000-memory.dmp

Filesize
24KB

Download
memory/4780-18-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download