4c823988b548f47ca28ab5f06d47f52f24634c4c483fc745cf5f40434146cb70

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
22-05-2024 02:36

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General

Target

2024-05-22_dfa1fa3c1d66d405aff948dc520176c3_cryptolocker.exe
Size

40KB
MD5

dfa1fa3c1d66d405aff948dc520176c3
SHA1

f8d44238d465d62723d47addfdc90f03ea906445
SHA256

4c823988b548f47ca28ab5f06d47f52f24634c4c483fc745cf5f40434146cb70
SHA512

b3cb104e8d296fb1d2e8b590d369a573489b7316061c5a0e7307fe433cafe4b90022773c8fffb7b6214321d1ab5211c9cd0af08b2a6008b41b22faa29864a120
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYV:qDdFJy3QMOtEvwDpjjWMl7Tg

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1072-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/1072-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2752-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2752-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1072-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/1072-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2752-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2752-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1072-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/1072-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2752-19-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2752-28-0x0000000000500000-0x0000000000510000-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:

2024-05-22_dfa1fa3c1d66d405aff948dc520176c3_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	2024-05-22_dfa1fa3c1d66d405aff948dc520176c3_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

2752 asih.exe

pid	process
2752	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/1072-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/1072-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2752-19-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2752-28-0x0000000000500000-0x0000000000510000-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:

2024-05-22_dfa1fa3c1d66d405aff948dc520176c3_cryptolocker.exe

description	pid	process	target process
PID 1072 wrote to memory of 2752	1072	2024-05-22_dfa1fa3c1d66d405aff948dc520176c3_cryptolocker.exe	asih.exe
PID 1072 wrote to memory of 2752	1072	2024-05-22_dfa1fa3c1d66d405aff948dc520176c3_cryptolocker.exe	asih.exe
PID 1072 wrote to memory of 2752	1072	2024-05-22_dfa1fa3c1d66d405aff948dc520176c3_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-22_dfa1fa3c1d66d405aff948dc520176c3_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-22_dfa1fa3c1d66d405aff948dc520176c3_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1072

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:2752

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
40KB

MD5
121fbe3687b70905c52a6ee572925355

SHA1
0939bffd8db0a09ffd9561bfc819be81d9bd8561

SHA256
d850dff677e0ae297ff787730adcfe107c43e65ed2d6da3937899730238297c2

SHA512
b761f2dcef7739615b402bd4e8ac6806ebd6fd5a427f7ed706d39a599be7c3c34bb8f22ed532800bf4f37751dfa7fd577b21dd2e627a5975582237036c0383bc

Download Submit
memory/1072-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1072-1-0x0000000000560000-0x0000000000566000-memory.dmp

Filesize
24KB

Download
memory/1072-2-0x0000000002070000-0x0000000002076000-memory.dmp

Filesize
24KB

Download
memory/1072-9-0x0000000000560000-0x0000000000566000-memory.dmp

Filesize
24KB

Download
memory/1072-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2752-19-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2752-21-0x0000000000860000-0x0000000000866000-memory.dmp

Filesize
24KB

Download
memory/2752-27-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/2752-28-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download