f8fc2d62026b09f5e00b69e21b6d58126986abb6a6d80a60305ebe9e1d8ba6dd

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 04:25

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General

Target

2024-05-24_2779f27e221dba32413b82fae93a51af_cryptolocker.exe
Size

39KB
MD5

2779f27e221dba32413b82fae93a51af
SHA1

aac6f94fd6450d96af3ba3fa91e445a3a735914f
SHA256

f8fc2d62026b09f5e00b69e21b6d58126986abb6a6d80a60305ebe9e1d8ba6dd
SHA512

f5308dbc54d9d6720927812364cdba5be1003dc2a545842487c9ae2e4b83a89566cf76f461db7c5ccffdd3ae746d26f703e502958c56a2aee714ee26d5f45739
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYan8Z1v:qDdFJy3QMOtEvwDpjjWMl7Tdn8Z9

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4644-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/1252-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4644-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1252-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4644-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/1252-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4644-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1252-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4644-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/1252-19-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4644-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/1252-28-0x0000000000500000-0x0000000000510000-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:

2024-05-24_2779f27e221dba32413b82fae93a51af_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	2024-05-24_2779f27e221dba32413b82fae93a51af_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

1252 asih.exe

pid	process
1252	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/4644-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/1252-19-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4644-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/1252-28-0x0000000000500000-0x0000000000510000-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:

2024-05-24_2779f27e221dba32413b82fae93a51af_cryptolocker.exe

description	pid	process	target process
PID 4644 wrote to memory of 1252	4644	2024-05-24_2779f27e221dba32413b82fae93a51af_cryptolocker.exe	asih.exe
PID 4644 wrote to memory of 1252	4644	2024-05-24_2779f27e221dba32413b82fae93a51af_cryptolocker.exe	asih.exe
PID 4644 wrote to memory of 1252	4644	2024-05-24_2779f27e221dba32413b82fae93a51af_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-24_2779f27e221dba32413b82fae93a51af_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-24_2779f27e221dba32413b82fae93a51af_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4644
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:1252

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
cf38e455a355e6eb20c67f96150ec2c1

SHA1
49dd5e3f5b3fa3b9da8584d215814103672ae164

SHA256
8226651a92e1ec1d1e6c790dc53e449a3b6f81ad37b70a4e097b33c3617d063d

SHA512
4d5823775ec6f6ebb56c2b650cce63ad5fa8f0e99e29faa0bc90b8b888bb2caa5e4f923dd8a56908e08dc432d3b4d8db38eec358dcc636d81f7681623c66e5d9

Download Submit
memory/1252-19-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1252-21-0x00000000005D0000-0x00000000005D6000-memory.dmp

Filesize
24KB

Download
memory/1252-27-0x00000000005B0000-0x00000000005B6000-memory.dmp

Filesize
24KB

Download
memory/1252-28-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4644-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4644-1-0x00000000007B0000-0x00000000007B6000-memory.dmp

Filesize
24KB

Download
memory/4644-2-0x0000000002070000-0x0000000002076000-memory.dmp

Filesize
24KB

Download
memory/4644-9-0x00000000007B0000-0x00000000007B6000-memory.dmp

Filesize
24KB

Download
memory/4644-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download