21c7ae9d39bb043533dc137737993c4736cb6ebd528950ecbce486ac97991fb6

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
21-05-2024 15:03

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General

Target

2024-05-21_e63ad7d39f46eda10a2d7f323e37d80c_cryptolocker.exe
Size

91KB
MD5

e63ad7d39f46eda10a2d7f323e37d80c
SHA1

6fdf357dd360548fffbf3cf414c9efb3898160f6
SHA256

21c7ae9d39bb043533dc137737993c4736cb6ebd528950ecbce486ac97991fb6
SHA512

8b0ef2ff385781633dcb2de17385f7fb9945b96aca1a6b06ec4e9aafce9bf9737ca25997adc9292ad7aa8016833e40ff6d9a53ac54ba9d7a0a0b186c0132d836
SSDEEP

1536:n6QFElP6n+g9u9cvMOtEvwDpjYYTjipvF2bx1PQAA/DV:n6a+1SEOtEvwDpjYYvQd2P6

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1596-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/2020-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1596-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2020-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1596-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/2020-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1596-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2020-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1596-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/2020-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/1596-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2020-27-0x0000000000500000-0x0000000000510000-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:

2024-05-21_e63ad7d39f46eda10a2d7f323e37d80c_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	2024-05-21_e63ad7d39f46eda10a2d7f323e37d80c_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

2020 asih.exe

pid	process
2020	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/1596-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/2020-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/1596-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2020-27-0x0000000000500000-0x0000000000510000-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:

2024-05-21_e63ad7d39f46eda10a2d7f323e37d80c_cryptolocker.exe

description	pid	process	target process
PID 1596 wrote to memory of 2020	1596	2024-05-21_e63ad7d39f46eda10a2d7f323e37d80c_cryptolocker.exe	asih.exe
PID 1596 wrote to memory of 2020	1596	2024-05-21_e63ad7d39f46eda10a2d7f323e37d80c_cryptolocker.exe	asih.exe
PID 1596 wrote to memory of 2020	1596	2024-05-21_e63ad7d39f46eda10a2d7f323e37d80c_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-21_e63ad7d39f46eda10a2d7f323e37d80c_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-21_e63ad7d39f46eda10a2d7f323e37d80c_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1596

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:2020

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
91KB

MD5
c7cc1a7710d334bc035e8c2c53f49b48

SHA1
e7a8eedbb4f36065f9c8365b08412e3128680977

SHA256
040f9a33d4e5563372d4f7afb68daaab03165d14f815b5e0616f5bc44ad5f141

SHA512
c4f5e66f13edba821dd550a0652d6aa74852eb6d6f5fe7421f688a604d90e066cd670c52cc4447d52232c0719279f75fc5773171c10b1d9a6dcab4773df6e66e

Download Submit
memory/1596-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1596-1-0x00000000006B0000-0x00000000006B6000-memory.dmp

Filesize
24KB

Download
memory/1596-2-0x00000000006D0000-0x00000000006D6000-memory.dmp

Filesize
24KB

Download
memory/1596-9-0x00000000006B0000-0x00000000006B6000-memory.dmp

Filesize
24KB

Download
memory/1596-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2020-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2020-20-0x0000000000510000-0x0000000000516000-memory.dmp

Filesize
24KB

Download
memory/2020-26-0x00000000004E0000-0x00000000004E6000-memory.dmp

Filesize
24KB

Download
memory/2020-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download