fa1cb6e51aef9557496cd1cdfd43dc0f414dd356f68cb45788e49d4de0ed5245

Analysis

max time kernel
150s
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
20/05/2024, 06:35

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General

Target

2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe
Size

52KB
MD5

4f2f7c79ad5317e16f18d2bde3ee64bf
SHA1

53178e6f019b4d0d38b92cc2ce33ee7394dbc5a0
SHA256

fa1cb6e51aef9557496cd1cdfd43dc0f414dd356f68cb45788e49d4de0ed5245
SHA512

59e2dce81dbc81d3f115298f4dc3cb05163d6b5e5d4bc62d45d41beef676688dee408174c161fddc348bd32f087af791caeb3970383ddca7b712beaad44a84be
SSDEEP

768:bODOw9UiamWUB2preAr+OfjH/0S16avdrQFiLjJvtOO:bODOw9acifAoc+vB

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/4388-0-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x0008000000022f51-13.dat	CryptoLocker_rule2
behavioral2/memory/3904-17-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4388-18-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3904-27-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/4388-0-0x0000000008000000-0x000000000800F000-memory.dmp	UPX
behavioral2/files/0x0008000000022f51-13.dat	UPX
behavioral2/memory/3904-17-0x0000000008000000-0x000000000800F000-memory.dmp	UPX
behavioral2/memory/4388-18-0x0000000008000000-0x000000000800F000-memory.dmp	UPX
behavioral2/memory/3904-27-0x0000000008000000-0x000000000800F000-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-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
3904	lossy.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4388-0-0x0000000008000000-0x000000000800F000-memory.dmp	upx
behavioral2/files/0x0008000000022f51-13.dat	upx
behavioral2/memory/3904-17-0x0000000008000000-0x000000000800F000-memory.dmp	upx
behavioral2/memory/4388-18-0x0000000008000000-0x000000000800F000-memory.dmp	upx
behavioral2/memory/3904-27-0x0000000008000000-0x000000000800F000-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 4388 wrote to memory of 3904	4388	2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe	84
PID 4388 wrote to memory of 3904	4388	2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe	84
PID 4388 wrote to memory of 3904	4388	2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe	84

C:\Users\Admin\AppData\Local\Temp\2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4388
- C:\Users\Admin\AppData\Local\Temp\lossy.exe
  "C:\Users\Admin\AppData\Local\Temp\lossy.exe"
  2⤵
  - Executes dropped EXE
  PID:3904

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\lossy.exe

Filesize
52KB

MD5
0caa521bd794e19e0f935571661c62db

SHA1
4d9b34fd0e0df5a01d0067c3185bb31db4c709e7

SHA256
0181b70b1538e988ea1969ae7c6f3b4fb8c4002fa3ff60ba6a9dad412b56a96c

SHA512
d8c2cc2e7d325ba3d9acd4f3d495490ee31b44e06d37ada6cf1df2aac72db28d2d7c1d1681e0f591d480a64f3771e8e6f591ec5e86a882e855d2a43a62e68358

Download Submit
memory/3904-17-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/3904-26-0x00000000005B0000-0x00000000005B6000-memory.dmp

Filesize
24KB

Download
memory/3904-20-0x00000000020F0000-0x00000000020F6000-memory.dmp

Filesize
24KB

Download
memory/3904-27-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/4388-0-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/4388-1-0x0000000000620000-0x0000000000626000-memory.dmp

Filesize
24KB

Download
memory/4388-2-0x0000000000640000-0x0000000000646000-memory.dmp

Filesize
24KB

Download
memory/4388-9-0x0000000000620000-0x0000000000626000-memory.dmp

Filesize
24KB

Download
memory/4388-18-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download