7bd5ee7546eb876f32aeb98b69afdf75e01644af9ba17b0fb63ecc3f650a5306

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
28/02/2024, 10:31

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General

Target

2024-02-28_281f6dcc6a80c5d35713208b8f87e61e_cryptolocker.exe
Size

72KB
MD5

281f6dcc6a80c5d35713208b8f87e61e
SHA1

439f0a6a3bffc8ad3e9b470e2699f7b50d42903b
SHA256

7bd5ee7546eb876f32aeb98b69afdf75e01644af9ba17b0fb63ecc3f650a5306
SHA512

8a5d252426f3db1216ea270b85f021da708eb18cfbd546cb1a72e5d8869fc692eba43c35d9d4372ac0cc3a1ec19b062e68adf425aa043cf99b55d558f94035ff
SSDEEP

1536:P8mnK6QFElP6n+gymddpMOtEvwDpjIHsale0:1nK6a+qdOOtEvwDpjY

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/4544-0-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000400000001e5eb-13.dat	CryptoLocker_rule2
behavioral2/memory/4544-17-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4320-26-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/4544-0-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1
behavioral2/files/0x000400000001e5eb-13.dat	CryptoLocker_set1
behavioral2/memory/4544-17-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1
behavioral2/memory/4320-26-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/4544-0-0x0000000000500000-0x000000000050F311-memory.dmp	UPX
behavioral2/files/0x000400000001e5eb-13.dat	UPX
behavioral2/memory/4544-17-0x0000000000500000-0x000000000050F311-memory.dmp	UPX
behavioral2/memory/4320-26-0x0000000000500000-0x000000000050F311-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-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	2024-02-28_281f6dcc6a80c5d35713208b8f87e61e_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
4320	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4544-0-0x0000000000500000-0x000000000050F311-memory.dmp	upx
behavioral2/files/0x000400000001e5eb-13.dat	upx
behavioral2/memory/4544-17-0x0000000000500000-0x000000000050F311-memory.dmp	upx
behavioral2/memory/4320-26-0x0000000000500000-0x000000000050F311-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 4544 wrote to memory of 4320	4544	2024-02-28_281f6dcc6a80c5d35713208b8f87e61e_cryptolocker.exe	87
PID 4544 wrote to memory of 4320	4544	2024-02-28_281f6dcc6a80c5d35713208b8f87e61e_cryptolocker.exe	87
PID 4544 wrote to memory of 4320	4544	2024-02-28_281f6dcc6a80c5d35713208b8f87e61e_cryptolocker.exe	87

C:\Users\Admin\AppData\Local\Temp\2024-02-28_281f6dcc6a80c5d35713208b8f87e61e_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-28_281f6dcc6a80c5d35713208b8f87e61e_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4544
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:4320

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
72KB

MD5
d62b0ec9b261055a08ce18b20e5ab5f6

SHA1
b5e957cc3615472a487f9cc413f5989c17e96b4a

SHA256
f0e618ca049b9751b5fdca62905b623482c8096ac7e8927aa0d1fbfe304f7890

SHA512
460d4357eadaec3427aa784601edf0b69ac8d2034067bb0f77fb7d8a464934d5e0bad430b27bca9a486c8b5c2b3e82ba0a3713249324670e70a0185b61a88fc7

Download Submit
memory/4320-21-0x00000000004F0000-0x00000000004F6000-memory.dmp

Filesize
24KB

Download
memory/4320-19-0x0000000002110000-0x0000000002116000-memory.dmp

Filesize
24KB

Download
memory/4320-26-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download
memory/4544-0-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download
memory/4544-1-0x0000000000740000-0x0000000000746000-memory.dmp

Filesize
24KB

Download
memory/4544-2-0x0000000000740000-0x0000000000746000-memory.dmp

Filesize
24KB

Download
memory/4544-3-0x0000000000770000-0x0000000000776000-memory.dmp

Filesize
24KB

Download
memory/4544-17-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download