57f258d6f8f5c3f709d996701d34826a59b319e2791196ca9427bdf5a0e31730

Analysis

max time kernel
148s
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
24-05-2024 04:13

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General

Target

2024-05-24_f6d28fb77cccde9d5cc9a2dbb5cd805a_cryptolocker.exe
Size

53KB
MD5

f6d28fb77cccde9d5cc9a2dbb5cd805a
SHA1

b234b36f27dc46c04b6587bfa50a797a13d7f08e
SHA256

57f258d6f8f5c3f709d996701d34826a59b319e2791196ca9427bdf5a0e31730
SHA512

1e78ac926161702af517dd41e95bd808eacffc2d7af1e75578c6fdf7ef47e5fb00ca5955e94424a513216155ca7f77d9e4199bebbc501a3f1baa91c030fb3f08
SSDEEP

768:z6LsoEEeegiZPvEhHSG+gzum/kLyMro2GtOOtEvwDpj/YY1J+OTOs:z6QFElP6n+gKmddpMOtEvwDpj31is

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/404-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/1340-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/404-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1340-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/404-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/1340-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/404-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1340-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/404-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/1340-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/404-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/1340-27-0x0000000000500000-0x0000000000510000-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:

2024-05-24_f6d28fb77cccde9d5cc9a2dbb5cd805a_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation	2024-05-24_f6d28fb77cccde9d5cc9a2dbb5cd805a_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

1340 asih.exe

pid	process
1340	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/404-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/1340-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/404-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/1340-27-0x0000000000500000-0x0000000000510000-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:

2024-05-24_f6d28fb77cccde9d5cc9a2dbb5cd805a_cryptolocker.exe

description	pid	process	target process
PID 404 wrote to memory of 1340	404	2024-05-24_f6d28fb77cccde9d5cc9a2dbb5cd805a_cryptolocker.exe	asih.exe
PID 404 wrote to memory of 1340	404	2024-05-24_f6d28fb77cccde9d5cc9a2dbb5cd805a_cryptolocker.exe	asih.exe
PID 404 wrote to memory of 1340	404	2024-05-24_f6d28fb77cccde9d5cc9a2dbb5cd805a_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-24_f6d28fb77cccde9d5cc9a2dbb5cd805a_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-24_f6d28fb77cccde9d5cc9a2dbb5cd805a_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:404

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:1340

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe
Filesize
53KB

MD5
fb61c1b31206b5b2ddc0a19a796b05f6

SHA1
e6e754a3c8efd223fd896e49854a05019d899875

SHA256
d9b70fb567221ab700cda1035f8e838181fff837405e82c555d300210ad2528d

SHA512
401e417c56486adf885b5aa1e2398eee9e81dc013dc8b5965ec79b8b6f62afa3d6d03a71d1577faa659e09fcdd11b2ba415588965c1f53a913f648ea721f8f76

Download Submit
memory/404-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/404-1-0x0000000000750000-0x0000000000756000-memory.dmp

Filesize
24KB

Download
memory/404-2-0x0000000000770000-0x0000000000776000-memory.dmp

Filesize
24KB

Download
memory/404-9-0x0000000000750000-0x0000000000756000-memory.dmp

Filesize
24KB

Download
memory/404-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1340-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1340-21-0x0000000002080000-0x0000000002086000-memory.dmp

Filesize
24KB

Download
memory/1340-26-0x00000000004E0000-0x00000000004E6000-memory.dmp

Filesize
24KB

Download
memory/1340-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download