3bb53540291c85684477c6b7cf7785ecc5dbe74efbc0ee99428545a8165c60c1

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
05/04/2024, 21:34

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General

Target

2024-04-05_8781a70d11fecd913838d44891001b74_cryptolocker.exe
Size

71KB
MD5

8781a70d11fecd913838d44891001b74
SHA1

908e2e3ef3127313f0d7d89c192cd4b4ed0cec89
SHA256

3bb53540291c85684477c6b7cf7785ecc5dbe74efbc0ee99428545a8165c60c1
SHA512

5f78b34f9471b346f08539dc7be69e8790f60f362d2af537022bd4130aaa8acc664359a42c0cb558e47ea34751571513e10d78cca505d887612e2f89a96ac2fe
SSDEEP

1536:z6QFElP6n+gKmddpMOtEvwDpj9aYaFAeBQ:z6a+CdOOtEvwDpjQ+

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/3924-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000800000002322c-13.dat	CryptoLocker_rule2
behavioral2/memory/3924-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2764-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/3924-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x000800000002322c-13.dat	CryptoLocker_set1
behavioral2/memory/3924-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2764-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/3924-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x000800000002322c-13.dat	UPX
behavioral2/memory/3924-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2764-26-0x0000000000500000-0x0000000000510000-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-1-5-21-399997616-3400990511-967324271-1000\Control Panel\International\Geo\Nation	2024-04-05_8781a70d11fecd913838d44891001b74_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
2764	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3924-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x000800000002322c-13.dat	upx
behavioral2/memory/3924-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2764-26-0x0000000000500000-0x0000000000510000-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 3924 wrote to memory of 2764	3924	2024-04-05_8781a70d11fecd913838d44891001b74_cryptolocker.exe	85
PID 3924 wrote to memory of 2764	3924	2024-04-05_8781a70d11fecd913838d44891001b74_cryptolocker.exe	85
PID 3924 wrote to memory of 2764	3924	2024-04-05_8781a70d11fecd913838d44891001b74_cryptolocker.exe	85

C:\Users\Admin\AppData\Local\Temp\2024-04-05_8781a70d11fecd913838d44891001b74_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-05_8781a70d11fecd913838d44891001b74_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3924
- 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

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\asih.exe

Filesize
72KB

MD5
a39905f7ce9d8404535072ece29e1c97

SHA1
c2ac5d2625dfa10971607e068fb33f6d7e805d9f

SHA256
3932f3db5cf8a51a35e49553330a7e019a6f698d2b26f66a5b75cfee358ed028

SHA512
aa7b651de4be9d244dfd36638fd5874549134476f77fe0d41540192bf80aebea06748d77fcddd3505c2da5bcd90dcda71cfcdf6039b7b9c2759d3b23375d7c2a

Download Submit
memory/2764-21-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/2764-19-0x00000000004F0000-0x00000000004F6000-memory.dmp

Filesize
24KB

Download
memory/2764-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3924-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3924-1-0x00000000005F0000-0x00000000005F6000-memory.dmp

Filesize
24KB

Download
memory/3924-2-0x00000000005F0000-0x00000000005F6000-memory.dmp

Filesize
24KB

Download
memory/3924-3-0x0000000000610000-0x0000000000616000-memory.dmp

Filesize
24KB

Download
memory/3924-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download