b77bac988167523362851ef6942cd42b86d233ef84771f680859cfcfb06fd9d4

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
23-05-2024 00:58

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General

Target

2024-05-23_ebf902c7ef05fa767158c5edbd5b4462_cryptolocker.exe
Size

40KB
MD5

ebf902c7ef05fa767158c5edbd5b4462
SHA1

894eeec88992c065246b05965bdec5441edd740f
SHA256

b77bac988167523362851ef6942cd42b86d233ef84771f680859cfcfb06fd9d4
SHA512

5f854a8d9c4f0d3194e4e64b4af0b4cb40724f3e52e788fd8caf72d3c405e899fecf7200769142b457b2c34176f849eeed68d19712a3d2d7b08176d126dd16b8
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYaB0gj:qDdFJy3QMOtEvwDpjjWMl7TdCgj

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2816-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/3948-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2816-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3948-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2816-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/3948-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2816-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3948-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2816-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/3948-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2816-19-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/3948-28-0x0000000000500000-0x0000000000510000-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:

2024-05-23_ebf902c7ef05fa767158c5edbd5b4462_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation	2024-05-23_ebf902c7ef05fa767158c5edbd5b4462_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

3948 asih.exe

pid	process
3948	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/2816-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/3948-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2816-19-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/3948-28-0x0000000000500000-0x0000000000510000-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:

2024-05-23_ebf902c7ef05fa767158c5edbd5b4462_cryptolocker.exe

description	pid	process	target process
PID 2816 wrote to memory of 3948	2816	2024-05-23_ebf902c7ef05fa767158c5edbd5b4462_cryptolocker.exe	asih.exe
PID 2816 wrote to memory of 3948	2816	2024-05-23_ebf902c7ef05fa767158c5edbd5b4462_cryptolocker.exe	asih.exe
PID 2816 wrote to memory of 3948	2816	2024-05-23_ebf902c7ef05fa767158c5edbd5b4462_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-23_ebf902c7ef05fa767158c5edbd5b4462_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-23_ebf902c7ef05fa767158c5edbd5b4462_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2816

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:3948

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
58bb664b8de65654000ebbb407281154

SHA1
6a363a8c3223ab6a2d31c33555162af6560463fa

SHA256
067e1db1a2f988128eb31165cbbe9889681a412f056c7614a7fd5538f7be9196

SHA512
120a224375bb8df25a02722e48b2c7b2e15ee736a28865ec0d9c8328eaace0e191e703920560fa7d3db5a8e7837833188875c8cd01ab17811e0977b1b37cda41

Download Submit
memory/2816-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2816-1-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/2816-2-0x00000000007D0000-0x00000000007D6000-memory.dmp

Filesize
24KB

Download
memory/2816-8-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/2816-19-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3948-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3948-21-0x0000000002000000-0x0000000002006000-memory.dmp

Filesize
24KB

Download
memory/3948-27-0x0000000001FE0000-0x0000000001FE6000-memory.dmp

Filesize
24KB

Download
memory/3948-28-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download