bd7dd33a51d7b8f45955dcbbed0aefdbefa5ec275032be9bbbd355a208ec6dca

Analysis

max time kernel
149s
max time network
153s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
22-05-2024 21:08

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General

Target

2024-05-22_f5dd6718ca76c4172b4b2e0222f611aa_cryptolocker.exe
Size

52KB
MD5

f5dd6718ca76c4172b4b2e0222f611aa
SHA1

678a66f1cd2412f82ffe2eda528844043306c870
SHA256

bd7dd33a51d7b8f45955dcbbed0aefdbefa5ec275032be9bbbd355a208ec6dca
SHA512

86d7ceef7815ab02a5ce84568072dda46a50973385db7e9859049c127f444e40cf176de54e7ea0e9b1226cfad5f9cbf5eb25053924f66969efdc9b66d28e6ddb
SSDEEP

768:bODOw9UiamWUB2preAr+OfjH/0S16avdrQFiLjJvtOna:bODOw9acifAoc+vsa

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\lossy.exe	CryptoLocker_rule2
behavioral1/memory/2224-15-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2
behavioral1/memory/2856-1-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2
behavioral1/memory/2224-25-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2

UPX dump on OEP (original entry point) 4 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\lossy.exe	UPX
behavioral1/memory/2224-15-0x0000000008000000-0x000000000800F000-memory.dmp	UPX
behavioral1/memory/2856-1-0x0000000008000000-0x000000000800F000-memory.dmp	UPX
behavioral1/memory/2224-25-0x0000000008000000-0x000000000800F000-memory.dmp	UPX

Executes dropped EXE 1 IoCs

Processes:

lossy.exe

pid process

2224 lossy.exe
Loads dropped DLL 1 IoCs

Processes:

2024-05-22_f5dd6718ca76c4172b4b2e0222f611aa_cryptolocker.exe

pid process

2856 2024-05-22_f5dd6718ca76c4172b4b2e0222f611aa_cryptolocker.exe

pid	process
2224	lossy.exe

pid	process
2856	2024-05-22_f5dd6718ca76c4172b4b2e0222f611aa_cryptolocker.exe

UPX packed file 4 IoCs

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

upx

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\lossy.exe	upx
behavioral1/memory/2224-15-0x0000000008000000-0x000000000800F000-memory.dmp	upx
behavioral1/memory/2856-1-0x0000000008000000-0x000000000800F000-memory.dmp	upx
behavioral1/memory/2224-25-0x0000000008000000-0x000000000800F000-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 4 IoCs

Processes:

2024-05-22_f5dd6718ca76c4172b4b2e0222f611aa_cryptolocker.exe

description	pid	process	target process
PID 2856 wrote to memory of 2224	2856	2024-05-22_f5dd6718ca76c4172b4b2e0222f611aa_cryptolocker.exe	lossy.exe
PID 2856 wrote to memory of 2224	2856	2024-05-22_f5dd6718ca76c4172b4b2e0222f611aa_cryptolocker.exe	lossy.exe
PID 2856 wrote to memory of 2224	2856	2024-05-22_f5dd6718ca76c4172b4b2e0222f611aa_cryptolocker.exe	lossy.exe
PID 2856 wrote to memory of 2224	2856	2024-05-22_f5dd6718ca76c4172b4b2e0222f611aa_cryptolocker.exe	lossy.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-22_f5dd6718ca76c4172b4b2e0222f611aa_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-22_f5dd6718ca76c4172b4b2e0222f611aa_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2856
- C:\Users\Admin\AppData\Local\Temp\lossy.exe
  "C:\Users\Admin\AppData\Local\Temp\lossy.exe"
  2⤵
  - Executes dropped EXE
  PID:2224

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
52KB

MD5
c00e295e8dab27910f299d187d24e320

SHA1
14d481fc655579978db8e310a22306cded9434bf

SHA256
24b451042f144d0987c0662f10430bdca13ade8c107ecc1100699e3d31fed991

SHA512
68e7a8e8b5b6ba2baf40a5a1e037266b84bd286e9e9d2d5c1950bdeff6899786665e6c097a50e27a1f3e663540a72fa3301fc83cf665d0273751ddb6c863beb1

Download Submit
memory/2224-17-0x00000000004B0000-0x00000000004B6000-memory.dmp

Filesize
24KB

Download
memory/2224-24-0x0000000000310000-0x0000000000316000-memory.dmp

Filesize
24KB

Download
memory/2224-15-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/2224-25-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/2856-3-0x00000000003F0000-0x00000000003F6000-memory.dmp

Filesize
24KB

Download
memory/2856-2-0x00000000001C0000-0x00000000001C6000-memory.dmp

Filesize
24KB

Download
memory/2856-1-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/2856-0-0x00000000001C0000-0x00000000001C6000-memory.dmp

Filesize
24KB

Download