efa9a28bda455561043ccddca4fe61d76b4f2dc14d2e2cae7ef96957b8df7d57

General

Target

2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe
Size

80KB
MD5

dfc68a4422144377f4a7e8dab62aef32
SHA1

e52f5fcd63471fd930d5999cc62505fb17dd8b69
SHA256

efa9a28bda455561043ccddca4fe61d76b4f2dc14d2e2cae7ef96957b8df7d57
SHA512

f467998cae25617f6f440182d29dc7fd29e47f29f686ff3772ea5b84ae37dbbd0968bd723c4af9ae86655d823a761b92f4e17873a15fc5143140f0df1917b734
SSDEEP

1536:T6QFElP6n+gxmddpMOtEvwDpjwaxTNUOAkXtBd0nJ:T6a+rdOOtEvwDpjNtK

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 6 IoCs

resource	yara_rule
behavioral1/memory/1588-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral1/files/0x000900000001225c-11.dat	CryptoLocker_rule2
behavioral1/memory/1588-15-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral1/memory/1588-14-0x0000000001EF0000-0x0000000001F00000-memory.dmp	CryptoLocker_rule2
behavioral1/memory/2764-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral1/memory/2764-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 6 IoCs

resource	yara_rule
behavioral1/memory/1588-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral1/files/0x000900000001225c-11.dat	CryptoLocker_set1
behavioral1/memory/1588-15-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral1/memory/1588-14-0x0000000001EF0000-0x0000000001F00000-memory.dmp	CryptoLocker_set1
behavioral1/memory/2764-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral1/memory/2764-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral1/memory/1588-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral1/files/0x000900000001225c-11.dat	UPX
behavioral1/memory/1588-15-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral1/memory/2764-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral1/memory/2764-28-0x0000000000500000-0x0000000000510000-memory.dmp	UPX

Executes dropped EXE 1 IoCs

pid	Process
2764	asih.exe

Loads dropped DLL 1 IoCs

pid	Process
1588	2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1588-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral1/files/0x000900000001225c-11.dat	upx
behavioral1/memory/1588-15-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral1/memory/2764-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral1/memory/2764-28-0x0000000000500000-0x0000000000510000-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 4 IoCs

description	pid	Process	procid_target
PID 1588 wrote to memory of 2764	1588	2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe	28
PID 1588 wrote to memory of 2764	1588	2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe	28
PID 1588 wrote to memory of 2764	1588	2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe	28
PID 1588 wrote to memory of 2764	1588	2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe	28

C:\Users\Admin\AppData\Local\Temp\2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1588
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:2764

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
80KB

MD5
41a177f8c44a7f18855c9e12482d5a0e

SHA1
be4ac75d4ed311ae55d03acdf79bb6cbbfc417b8

SHA256
5ad4b079bbc3c87380971bb6281b8c302ab527332e197db7c4ebb6cbbb893090

SHA512
94bfe8cb4ad073886878fc59d717229750da367b599564dd71ae85a731728ad69936e5c422247a509b06cadce5c967c750bb5415da5b973fc3c82bc1c9234dc8

Download Submit
memory/1588-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1588-1-0x0000000000320000-0x0000000000326000-memory.dmp

Filesize
24KB

Download
memory/1588-2-0x0000000000360000-0x0000000000366000-memory.dmp

Filesize
24KB

Download
memory/1588-3-0x0000000000320000-0x0000000000326000-memory.dmp

Filesize
24KB

Download
memory/1588-15-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1588-14-0x0000000001EF0000-0x0000000001F00000-memory.dmp

Filesize
64KB

Download
memory/1588-27-0x0000000001EF0000-0x0000000001F00000-memory.dmp

Filesize
64KB

Download
memory/2764-20-0x0000000000240000-0x0000000000246000-memory.dmp

Filesize
24KB

Download
memory/2764-19-0x0000000000370000-0x0000000000376000-memory.dmp

Filesize
24KB

Download
memory/2764-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2764-28-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

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