b078bbae5d2ebcef282df4ca4378ab098ea067a88ce78a3cf1765481d3be5c74

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
22-05-2024 21:37

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General

Target

2024-05-22_4c8fa1ee157c7f19997227b9c68b1335_cryptolocker.exe
Size

52KB
MD5

4c8fa1ee157c7f19997227b9c68b1335
SHA1

315a939f3433677b4c673f0eb63c253495bd021d
SHA256

b078bbae5d2ebcef282df4ca4378ab098ea067a88ce78a3cf1765481d3be5c74
SHA512

c4b06071e2fd4f5d6c6f795550f77025ff9913a7312f98d25764ca5197d81070ad0bff5c44bc025025474ef4253a0688cf5622f3900c0d7642d05310d3fba81f
SSDEEP

768:bODOw9UiamWUB2preAr+OfjH/0S16avdrQFiLjJvtOXh:bODOw9acifAoc+vW

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4716-0-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\lossy.exe	CryptoLocker_rule2
behavioral2/memory/4716-18-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4032-16-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4032-27-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4716-0-0x0000000008000000-0x000000000800F000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\lossy.exe	UPX
behavioral2/memory/4716-18-0x0000000008000000-0x000000000800F000-memory.dmp	UPX
behavioral2/memory/4032-16-0x0000000008000000-0x000000000800F000-memory.dmp	UPX
behavioral2/memory/4032-27-0x0000000008000000-0x000000000800F000-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

Processes:

2024-05-22_4c8fa1ee157c7f19997227b9c68b1335_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-540404634-651139247-2967210625-1000\Control Panel\International\Geo\Nation	2024-05-22_4c8fa1ee157c7f19997227b9c68b1335_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

lossy.exe

pid process

4032 lossy.exe

pid	process
4032	lossy.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/4716-0-0x0000000008000000-0x000000000800F000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\lossy.exe	upx
behavioral2/memory/4716-18-0x0000000008000000-0x000000000800F000-memory.dmp	upx
behavioral2/memory/4032-16-0x0000000008000000-0x000000000800F000-memory.dmp	upx
behavioral2/memory/4032-27-0x0000000008000000-0x000000000800F000-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

Processes:

2024-05-22_4c8fa1ee157c7f19997227b9c68b1335_cryptolocker.exe

description	pid	process	target process
PID 4716 wrote to memory of 4032	4716	2024-05-22_4c8fa1ee157c7f19997227b9c68b1335_cryptolocker.exe	lossy.exe
PID 4716 wrote to memory of 4032	4716	2024-05-22_4c8fa1ee157c7f19997227b9c68b1335_cryptolocker.exe	lossy.exe
PID 4716 wrote to memory of 4032	4716	2024-05-22_4c8fa1ee157c7f19997227b9c68b1335_cryptolocker.exe	lossy.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-22_4c8fa1ee157c7f19997227b9c68b1335_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-22_4c8fa1ee157c7f19997227b9c68b1335_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4716
- C:\Users\Admin\AppData\Local\Temp\lossy.exe
  "C:\Users\Admin\AppData\Local\Temp\lossy.exe"
  2⤵
  - Executes dropped EXE
  PID:4032

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
53KB

MD5
402c146e5532149905ff30b06d15191b

SHA1
375427f837840f7d19d675c31b5412b50bd26cef

SHA256
ac78c08ea9a0e109c081efa1e1e4f0f7eb7e919b77ee592c8c87a161a82f7e42

SHA512
693721c05fcd0e593dd1e47e58167d75d2833e5937289595d3ca10ba61cc2cfb168405302cf1ba90a475f3795b0de163c6f9945a471f91971692db2204dc7234

Download Submit
memory/4032-16-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/4032-20-0x0000000002050000-0x0000000002056000-memory.dmp

Filesize
24KB

Download
memory/4032-26-0x0000000002130000-0x0000000002136000-memory.dmp

Filesize
24KB

Download
memory/4032-27-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/4716-0-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/4716-1-0x00000000020C0000-0x00000000020C6000-memory.dmp

Filesize
24KB

Download
memory/4716-2-0x00000000020F0000-0x00000000020F6000-memory.dmp

Filesize
24KB

Download
memory/4716-9-0x00000000020C0000-0x00000000020C6000-memory.dmp

Filesize
24KB

Download
memory/4716-18-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download