2b5e6ecf8b80d9adf99085136aa5c5dcfd7f1e197f65eab7dde29235aa9e1c1c

Analysis

max time kernel
148s
max time network
156s
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 20:08

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General

Target

2024-05-22_41f637b48896f62788d664e93e36b248_cryptolocker.exe
Size

40KB
MD5

41f637b48896f62788d664e93e36b248
SHA1

75f9fcef0a18b5f83c6e2655a0a754b9f5f812c4
SHA256

2b5e6ecf8b80d9adf99085136aa5c5dcfd7f1e197f65eab7dde29235aa9e1c1c
SHA512

3106fdeff83fedd0e9c276dc7f16a13ecf536e7a77ee60042937bf20e035e53ff62b874122a64f84f912426d9ef106f5f26e06493a1ce9826d67d26e331a9008
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYaBY:qDdFJy3QMOtEvwDpjjWMl7Tdq

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1500-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/1500-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2696-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2696-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1500-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/1500-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2696-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2696-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1500-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/1500-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2696-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2696-27-0x0000000000500000-0x0000000000510000-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

Processes:

2024-05-22_41f637b48896f62788d664e93e36b248_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	2024-05-22_41f637b48896f62788d664e93e36b248_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

2696 asih.exe

pid	process
2696	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/1500-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/1500-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2696-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2696-27-0x0000000000500000-0x0000000000510000-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

Processes:

2024-05-22_41f637b48896f62788d664e93e36b248_cryptolocker.exe

description	pid	process	target process
PID 1500 wrote to memory of 2696	1500	2024-05-22_41f637b48896f62788d664e93e36b248_cryptolocker.exe	asih.exe
PID 1500 wrote to memory of 2696	1500	2024-05-22_41f637b48896f62788d664e93e36b248_cryptolocker.exe	asih.exe
PID 1500 wrote to memory of 2696	1500	2024-05-22_41f637b48896f62788d664e93e36b248_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-22_41f637b48896f62788d664e93e36b248_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-22_41f637b48896f62788d664e93e36b248_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1500
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:2696

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
40KB

MD5
a3c54431a8bb8dcfb9acce36c084c517

SHA1
2858123421614920a6bc35d25201fb440061130e

SHA256
f433090460ec98cae65070de2847345046611682e1e166b38bfceb9c0ac74bb7

SHA512
c7380f2dcee831ab10a94d6641821c079264e2e48f180ec421131558d096abe5dfb29512405542165fbd4f9661b3c8a23f2c899582abe5cb849faf252d59810c

Download Submit
memory/1500-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1500-1-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/1500-2-0x0000000002080000-0x0000000002086000-memory.dmp

Filesize
24KB

Download
memory/1500-9-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/1500-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2696-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2696-26-0x00000000004E0000-0x00000000004E6000-memory.dmp

Filesize
24KB

Download
memory/2696-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download