3cfa4c79963b90a47f6923b4f00c883e09e8f73a402d4a2ded9925dc2ecd6489

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
27-04-2024 22:22

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General

Target

2024-04-27_037507011db2942e93cf9faf3792d382_cryptolocker.exe
Size

38KB
MD5

037507011db2942e93cf9faf3792d382
SHA1

a3c07382676f1186ee6351623a41d8ccad7e896a
SHA256

3cfa4c79963b90a47f6923b4f00c883e09e8f73a402d4a2ded9925dc2ecd6489
SHA512

7e767dd4292f01cf22434ad19a76df4a29f0776372ee0c6691c7e59ba7ad32b5bf8b6fdfcfd65ed4f72e80026cacd6d76b11aadaf0d6f57b7fbc79b9cb2268c4
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYaP5:qDdFJy3QMOtEvwDpjjWMl7Tdx

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4744-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/4744-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3136-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3136-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4744-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/4744-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3136-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3136-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4744-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/4744-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/3136-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/3136-26-0x0000000000500000-0x0000000000510000-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:

2024-04-27_037507011db2942e93cf9faf3792d382_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-540404634-651139247-2967210625-1000\Control Panel\International\Geo\Nation	2024-04-27_037507011db2942e93cf9faf3792d382_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

3136 asih.exe

pid	process
3136	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/4744-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/4744-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/3136-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/3136-26-0x0000000000500000-0x0000000000510000-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:

2024-04-27_037507011db2942e93cf9faf3792d382_cryptolocker.exe

description	pid	process	target process
PID 4744 wrote to memory of 3136	4744	2024-04-27_037507011db2942e93cf9faf3792d382_cryptolocker.exe	asih.exe
PID 4744 wrote to memory of 3136	4744	2024-04-27_037507011db2942e93cf9faf3792d382_cryptolocker.exe	asih.exe
PID 4744 wrote to memory of 3136	4744	2024-04-27_037507011db2942e93cf9faf3792d382_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-04-27_037507011db2942e93cf9faf3792d382_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-27_037507011db2942e93cf9faf3792d382_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4744

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:3136

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe
Filesize
39KB

MD5
a88c238a254b88ff8573cca348f638ef

SHA1
e795b16c6d13896ce875990ca3de8775f3732e2d

SHA256
ee0a8233315d7a915af0d513bf6bb1a2a5416f944ae400387cea3dfc75288c3c

SHA512
5791bf517f0afc534dbb5a118e3171b71c520a84e53ac0ca0d38eb86d415899e411de125a987163b0bc060455872bac8cf501e81becda8f3a77dec9a323472e8

Download Submit
memory/3136-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3136-20-0x0000000001FF0000-0x0000000001FF6000-memory.dmp

Filesize
24KB

Download
memory/3136-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4744-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4744-1-0x00000000006B0000-0x00000000006B6000-memory.dmp

Filesize
24KB

Download
memory/4744-2-0x00000000006D0000-0x00000000006D6000-memory.dmp

Filesize
24KB

Download
memory/4744-9-0x00000000006B0000-0x00000000006B6000-memory.dmp

Filesize
24KB

Download
memory/4744-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download