99f6053f2b24c5a3de6d207d6fe6fc5086459a7a19d4ba24d4d177d63b16a686

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
23-05-2024 02:31

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General

Target

2024-05-23_687c814fb7772acd2e045799192a7f8c_cryptolocker.exe
Size

38KB
MD5

687c814fb7772acd2e045799192a7f8c
SHA1

f01284c6ace9893543e138e6af87fef7243a2ce9
SHA256

99f6053f2b24c5a3de6d207d6fe6fc5086459a7a19d4ba24d4d177d63b16a686
SHA512

704fad1225044070d930c37a64bdca2ea7d862562bd241dd78be10107da16d79688c738a824433efc80048807cce28351408b2cad90d171354c925fcfc255102
SSDEEP

768:qTVbxjgQNQXtckstOOtEvwDpjAaD3TUogs/VXpAPWRc:qTJu9cvMOtEvwDpjppVXzRc

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3932-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/3932-17-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3724-27-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3932-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/3932-17-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3724-27-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3932-0-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/3932-17-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/3724-27-0x0000000000500000-0x000000000050F000-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:

2024-05-23_687c814fb7772acd2e045799192a7f8c_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation	2024-05-23_687c814fb7772acd2e045799192a7f8c_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

3724 asih.exe

pid	process
3724	asih.exe

UPX packed file 4 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/3932-0-0x0000000000500000-0x000000000050F000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/3932-17-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/3724-27-0x0000000000500000-0x000000000050F000-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:

2024-05-23_687c814fb7772acd2e045799192a7f8c_cryptolocker.exe

description	pid	process	target process
PID 3932 wrote to memory of 3724	3932	2024-05-23_687c814fb7772acd2e045799192a7f8c_cryptolocker.exe	asih.exe
PID 3932 wrote to memory of 3724	3932	2024-05-23_687c814fb7772acd2e045799192a7f8c_cryptolocker.exe	asih.exe
PID 3932 wrote to memory of 3724	3932	2024-05-23_687c814fb7772acd2e045799192a7f8c_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-23_687c814fb7772acd2e045799192a7f8c_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-23_687c814fb7772acd2e045799192a7f8c_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3932

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:3724

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
38KB

MD5
819d086c0825a104ecaa0597c19df865

SHA1
c18a634fd36e4aa1e2f62933d2abf2515fea47f4

SHA256
2ef82a936106a3ae444d988d98908e2db43c9419034dc5a7b1d076f8111cd132

SHA512
e9f5d674efb5e919444f18981e049a98ddf8991f3406b62787f466126775fdce78d2e7924bf0fbfd14128f4e70ea84d06478a67e60b902fe43269e14466039af

Download Submit
memory/3724-20-0x00000000005D0000-0x00000000005D6000-memory.dmp

Filesize
24KB

Download
memory/3724-26-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/3724-27-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/3932-0-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/3932-9-0x0000000000520000-0x0000000000526000-memory.dmp

Filesize
24KB

Download
memory/3932-2-0x0000000000680000-0x0000000000686000-memory.dmp

Filesize
24KB

Download
memory/3932-1-0x0000000000520000-0x0000000000526000-memory.dmp

Filesize
24KB

Download
memory/3932-17-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download