b976cac8070f77b38e78877e68ce8dc9e6ef4826bd4ec477d4379304082ef46c

Analysis

max time kernel
141s
max time network
160s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
29-01-2024 04:49

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General

Target

2024-01-29_fd6d598ac31b3092ad66a27fde7ec16a_cryptolocker.exe
Size

69KB
MD5

fd6d598ac31b3092ad66a27fde7ec16a
SHA1

00be99879651fb078ee3ba8df96d7162b30cd0cb
SHA256

b976cac8070f77b38e78877e68ce8dc9e6ef4826bd4ec477d4379304082ef46c
SHA512

9cbf8ef046117239800c976aa7e43c1b09740a2d01089984114c5c8a7392005fce866e5f1fbc2ad7c8a7548257ba8fadef8471f09cb8472ee3773c8471335070
SSDEEP

1536:z6QFElP6n+gKmddpMOtEvwDpj9aYaFAeBQ:z6a+CdOOtEvwDpjQ+

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/4992-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x0007000000023142-13.dat	CryptoLocker_rule2
behavioral2/memory/4992-20-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2972-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/4992-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x0007000000023142-13.dat	CryptoLocker_set1
behavioral2/memory/4992-20-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2972-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/4992-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x0007000000023142-13.dat	UPX
behavioral2/memory/4992-20-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2972-26-0x0000000000500000-0x0000000000510000-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-1-5-21-3073191680-435865314-2862784915-1000\Control Panel\International\Geo\Nation	2024-01-29_fd6d598ac31b3092ad66a27fde7ec16a_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
2972	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4992-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x0007000000023142-13.dat	upx
behavioral2/memory/4992-20-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2972-26-0x0000000000500000-0x0000000000510000-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 4992 wrote to memory of 2972	4992	2024-01-29_fd6d598ac31b3092ad66a27fde7ec16a_cryptolocker.exe	84
PID 4992 wrote to memory of 2972	4992	2024-01-29_fd6d598ac31b3092ad66a27fde7ec16a_cryptolocker.exe	84
PID 4992 wrote to memory of 2972	4992	2024-01-29_fd6d598ac31b3092ad66a27fde7ec16a_cryptolocker.exe	84

C:\Users\Admin\AppData\Local\Temp\2024-01-29_fd6d598ac31b3092ad66a27fde7ec16a_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-01-29_fd6d598ac31b3092ad66a27fde7ec16a_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4992
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:2972

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
69KB

MD5
43869ba0e29043de7d766c81f58226a8

SHA1
5c5a4e5a571b222c93179285b608f2496006d6c3

SHA256
0d14fe2ffd3da212fb7f2a29c1ba1814083fcb572ce6acc17111fdeda1e355e2

SHA512
1b8e0ad73860dcdb360224b74732c35b43f3b87fa70be9d88ec255f3707720f9620c3b7549827debf38779f42d0ce78e206c3ce16e4e55a3fba989038c65c7eb

Download Submit
memory/2972-18-0x0000000000680000-0x0000000000686000-memory.dmp

Filesize
24KB

Download
memory/2972-19-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/2972-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4992-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4992-1-0x0000000002140000-0x0000000002146000-memory.dmp

Filesize
24KB

Download
memory/4992-2-0x0000000002140000-0x0000000002146000-memory.dmp

Filesize
24KB

Download
memory/4992-3-0x0000000002040000-0x0000000002046000-memory.dmp

Filesize
24KB

Download
memory/4992-20-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download