26eb20cd31000cf1cf8225496abc1878e9135da247c546b675d1264d1391448e

Analysis

max time kernel
155s
max time network
160s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
04/02/2024, 01:28

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General

Target

2024-02-04_43183d23a82c3cd940eb68838723bd9f_cryptolocker.exe
Size

66KB
MD5

43183d23a82c3cd940eb68838723bd9f
SHA1

24423329210d8e361d48a48b77d801a500dc65ad
SHA256

26eb20cd31000cf1cf8225496abc1878e9135da247c546b675d1264d1391448e
SHA512

96715a6f9ac18b6e50f570b11668da72527e8e08ef3e0fd237b4c9ac7ea4f407ede32088278230077858086be5a6048505d8ee5288227bd8ff1e06b1768114e0
SSDEEP

1536:z6QFElP6n+gKmddpMOtEvwDpj9aYaFAvCbDa6r:z6a+CdOOtEvwDpjQHr

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/3828-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000900000002313a-13.dat	CryptoLocker_rule2
behavioral2/memory/2548-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3828-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2548-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/3828-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x000900000002313a-13.dat	CryptoLocker_set1
behavioral2/memory/2548-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3828-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2548-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/3828-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x000900000002313a-13.dat	UPX
behavioral2/memory/2548-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/3828-26-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2548-27-0x0000000000500000-0x0000000000510000-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-1-5-21-635608581-3370340891-292606865-1000\Control Panel\International\Geo\Nation	2024-02-04_43183d23a82c3cd940eb68838723bd9f_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
2548	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3828-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x000900000002313a-13.dat	upx
behavioral2/memory/2548-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/3828-26-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2548-27-0x0000000000500000-0x0000000000510000-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 3828 wrote to memory of 2548	3828	2024-02-04_43183d23a82c3cd940eb68838723bd9f_cryptolocker.exe	89
PID 3828 wrote to memory of 2548	3828	2024-02-04_43183d23a82c3cd940eb68838723bd9f_cryptolocker.exe	89
PID 3828 wrote to memory of 2548	3828	2024-02-04_43183d23a82c3cd940eb68838723bd9f_cryptolocker.exe	89

C:\Users\Admin\AppData\Local\Temp\2024-02-04_43183d23a82c3cd940eb68838723bd9f_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-04_43183d23a82c3cd940eb68838723bd9f_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3828
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:2548

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe

Filesize
66KB

MD5
d4acbadb54d322974956d6ba28b1eb7a

SHA1
966992ede3ffb6e1651a2af87e3a64f9584849e9

SHA256
d36c917405d084e78359318b2ceb43f73f76d7fb884a220fd597e8b2fbd549d3

SHA512
82f38fb4a0eb205074ca190f2d63f6bd26ef218802b7ea2150b840d72d810dda925e0c35add4cac0b365ae220cc7b917a3c6ce6b20ff2e03e8b67980b16685da

Download Submit
memory/2548-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2548-20-0x00000000006C0000-0x00000000006C6000-memory.dmp

Filesize
24KB

Download
memory/2548-19-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/2548-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3828-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3828-1-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/3828-2-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/3828-3-0x00000000004F0000-0x00000000004F6000-memory.dmp

Filesize
24KB

Download
memory/3828-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download