c5048f3dc7cf79de71d40ea454ce4bac7ff1681412d0e037cf0803e14dfe2f33

Analysis

max time kernel
148s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240221-en
resource tags

arch:x64arch:x86image:win10v2004-20240221-enlocale:en-usos:windows10-2004-x64system
submitted
23/02/2024, 13:49

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General

Target

2024-02-23_41dea29650bd52d5d39792888cd69103_cryptolocker.exe
Size

75KB
MD5

41dea29650bd52d5d39792888cd69103
SHA1

5f511eecf95031b26146b4fe25e5ada34dc0c06d
SHA256

c5048f3dc7cf79de71d40ea454ce4bac7ff1681412d0e037cf0803e14dfe2f33
SHA512

504f1cb544af7feb8fc5f3117386e989e600651802e2e3d943c21e5ddfdd1c66e83dde0995890d5b9e6db5a24a61a2ad3fd0565e9583be2bd73602ade47bfa22
SSDEEP

1536:T6QFElP6n+gxmddpMOtEvwDpjwaxTNUOAkXtBdJcX:T6a+rdOOtEvwDpjNtk

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/4300-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x0007000000023247-13.dat	CryptoLocker_rule2
behavioral2/memory/4300-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/5028-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/4300-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x0007000000023247-13.dat	CryptoLocker_set1
behavioral2/memory/4300-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/5028-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/4300-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x0007000000023247-13.dat	UPX
behavioral2/memory/4300-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/5028-26-0x0000000000500000-0x0000000000510000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-910440534-423636034-2318342392-1000\Control Panel\International\Geo\Nation	2024-02-23_41dea29650bd52d5d39792888cd69103_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
5028	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4300-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x0007000000023247-13.dat	upx
behavioral2/memory/4300-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/5028-26-0x0000000000500000-0x0000000000510000-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

description	pid	Process	procid_target
PID 4300 wrote to memory of 5028	4300	2024-02-23_41dea29650bd52d5d39792888cd69103_cryptolocker.exe	89
PID 4300 wrote to memory of 5028	4300	2024-02-23_41dea29650bd52d5d39792888cd69103_cryptolocker.exe	89
PID 4300 wrote to memory of 5028	4300	2024-02-23_41dea29650bd52d5d39792888cd69103_cryptolocker.exe	89

C:\Users\Admin\AppData\Local\Temp\2024-02-23_41dea29650bd52d5d39792888cd69103_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-23_41dea29650bd52d5d39792888cd69103_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4300
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:5028

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
75KB

MD5
4a7dee2b728e0770af3cd6c0e68cdcc5

SHA1
4716e3de36298e0ae5455c59804ac7af669646c2

SHA256
bc2106d107a36fd91adb690a095294aa1df52ad7d4e5abf945b063a142bfaf6b

SHA512
44c50c08fcf32034a301de079ee37fd15321475d82126111ff5d18b9ba3dd27346ba6994058d00e3d18b3516a163537e94ebe50dfe76093bb3c3cab91d544687

Download Submit
memory/4300-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4300-1-0x00000000006B0000-0x00000000006B6000-memory.dmp

Filesize
24KB

Download
memory/4300-2-0x00000000006B0000-0x00000000006B6000-memory.dmp

Filesize
24KB

Download
memory/4300-3-0x0000000002080000-0x0000000002086000-memory.dmp

Filesize
24KB

Download
memory/4300-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/5028-19-0x0000000000650000-0x0000000000656000-memory.dmp

Filesize
24KB

Download
memory/5028-21-0x0000000000620000-0x0000000000626000-memory.dmp

Filesize
24KB

Download
memory/5028-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download