b7a8b3f6238b2010c56a3b92537f56aac1a5374c507128e79c43c5f4c84f7f16

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
16/03/2024, 04:21

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General

Target

2024-03-16_5f4d34b64a35144105cf6683f73082ea_cryptolocker.exe
Size

54KB
MD5

5f4d34b64a35144105cf6683f73082ea
SHA1

ea928163a57de6e7e897af594cdfe3fcfebe8bd7
SHA256

b7a8b3f6238b2010c56a3b92537f56aac1a5374c507128e79c43c5f4c84f7f16
SHA512

51e064515231c78cf902ae7cc0a680f38f773d0fc2085c56ec5edf3c44b4b144d7b975ad686b9f74663810458bc41af5abea21a7a199456b99f28725ccceb5ae
SSDEEP

768:z6LsoEEeegiZPvEhHSG+gzum/kLyMro2GtOOtEvwDpj/YMLam5axKy:z6QFElP6n+gKmddpMOtEvwDpj9aYax

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/1548-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x00090000000231f3-13.dat	CryptoLocker_rule2
behavioral2/memory/1548-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3512-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/1548-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x00090000000231f3-13.dat	CryptoLocker_set1
behavioral2/memory/1548-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3512-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/1548-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x00090000000231f3-13.dat	UPX
behavioral2/memory/1548-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/3512-26-0x0000000000500000-0x0000000000510000-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-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation	2024-03-16_5f4d34b64a35144105cf6683f73082ea_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
3512	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1548-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x00090000000231f3-13.dat	upx
behavioral2/memory/1548-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/3512-26-0x0000000000500000-0x0000000000510000-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 1548 wrote to memory of 3512	1548	2024-03-16_5f4d34b64a35144105cf6683f73082ea_cryptolocker.exe	85
PID 1548 wrote to memory of 3512	1548	2024-03-16_5f4d34b64a35144105cf6683f73082ea_cryptolocker.exe	85
PID 1548 wrote to memory of 3512	1548	2024-03-16_5f4d34b64a35144105cf6683f73082ea_cryptolocker.exe	85

C:\Users\Admin\AppData\Local\Temp\2024-03-16_5f4d34b64a35144105cf6683f73082ea_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-03-16_5f4d34b64a35144105cf6683f73082ea_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1548
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:3512

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
55KB

MD5
6de265ed6e89bce1f07ca5aac1b23888

SHA1
110e3955e83f0fd74d7b470f0dfd387a7321b7c2

SHA256
22d35d7e9afeade84b62faa7666fa6f1a64da8dfb2c06a25276c5cb49dc71f68

SHA512
cfa09721c1d4c41c649b22bf13f676976b37680d53b4f54e2e4992d6e6c6a22f0b3c65bdec05874c2f71cc99e1a523fd8b0b1737a1e96139eacd041fda7f06e8

Download Submit
memory/1548-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1548-1-0x0000000000870000-0x0000000000876000-memory.dmp

Filesize
24KB

Download
memory/1548-2-0x0000000000870000-0x0000000000876000-memory.dmp

Filesize
24KB

Download
memory/1548-3-0x0000000002230000-0x0000000002236000-memory.dmp

Filesize
24KB

Download
memory/1548-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3512-19-0x00000000006D0000-0x00000000006D6000-memory.dmp

Filesize
24KB

Download
memory/3512-21-0x00000000006B0000-0x00000000006B6000-memory.dmp

Filesize
24KB

Download
memory/3512-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download