b440eb0ce2511ba9c8abb3fb0441b90fa1b01ab96f38010c22a8476eb754d9ac

Analysis

max time kernel
148s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
12-02-2024 17:53

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General

Target

2024-02-12_e3956a8e8ffe81fca458f1f8d541c3b5_cryptolocker.exe
Size

55KB
MD5

e3956a8e8ffe81fca458f1f8d541c3b5
SHA1

35941d8c554ccbc36cc654c5c71a9bdb7e7cc12e
SHA256

b440eb0ce2511ba9c8abb3fb0441b90fa1b01ab96f38010c22a8476eb754d9ac
SHA512

89b720e97497f9f84f5ac5cd278de81656e71d56df8ccbcea1f5b8ad33036ddfa7ab5c61b82e56ce600a1d43e9f29ceb306ea5b91e66fcb53954cf48a7e18348
SSDEEP

1536:qmbhXDmjr5MOtEvwDpj5cDtKkQZQRKb619:BbdDmjr+OtEvwDpjML

Score

9^/10

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3984-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/3984-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/468-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/468-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 3 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3984-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/468-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/468-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3984-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/3984-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/468-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/468-27-0x0000000000500000-0x0000000000510000-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

Processes:

2024-02-12_e3956a8e8ffe81fca458f1f8d541c3b5_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1168293393-3419776239-306423207-1000\Control Panel\International\Geo\Nation	2024-02-12_e3956a8e8ffe81fca458f1f8d541c3b5_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

468 asih.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
468	asih.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

2024-02-12_e3956a8e8ffe81fca458f1f8d541c3b5_cryptolocker.exe

description	pid	process	target process
PID 3984 wrote to memory of 468	3984	2024-02-12_e3956a8e8ffe81fca458f1f8d541c3b5_cryptolocker.exe	asih.exe
PID 3984 wrote to memory of 468	3984	2024-02-12_e3956a8e8ffe81fca458f1f8d541c3b5_cryptolocker.exe	asih.exe
PID 3984 wrote to memory of 468	3984	2024-02-12_e3956a8e8ffe81fca458f1f8d541c3b5_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-02-12_e3956a8e8ffe81fca458f1f8d541c3b5_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-12_e3956a8e8ffe81fca458f1f8d541c3b5_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3984

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:468

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
55KB

MD5
d56ba0cb766254a62e747ae37cf5ed2b

SHA1
1fe1cdf1d72788d0474e5bd6af366719462cc7b7

SHA256
048080732b31d8c1c3e20494d2dabf77c6216a733431c8725689f0e511850c5f

SHA512
b4bbdb061446de9953e0451339931e6cd444e8c8f02edd517fd284df53e566ca66602f1bc8b96fb9a50376cbf63696d73ce852a7df496e8207e5e35a241d37d5

Download Submit
memory/468-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/468-20-0x0000000002060000-0x0000000002066000-memory.dmp

Filesize
24KB

Download
memory/468-22-0x0000000002140000-0x0000000002146000-memory.dmp

Filesize
24KB

Download
memory/468-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3984-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3984-1-0x00000000007D0000-0x00000000007D6000-memory.dmp

Filesize
24KB

Download
memory/3984-3-0x0000000002090000-0x0000000002096000-memory.dmp

Filesize
24KB

Download
memory/3984-2-0x00000000007D0000-0x00000000007D6000-memory.dmp

Filesize
24KB

Download
memory/3984-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download