939173135ec998c4a7d9381707ecdb3d956eedaa95f687b342e3d4191042978f

Analysis

max time kernel
150s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
27/03/2024, 04:20

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General

Target

2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe
Size

149KB
MD5

f23741f0ee2f9ea1991d62b51730e2b2
SHA1

d2c6e1b6ff239a4053472f169b1c99e532c943ec
SHA256

939173135ec998c4a7d9381707ecdb3d956eedaa95f687b342e3d4191042978f
SHA512

3e4398783ec48eb9bb12352cd26d8b916d77900e6e246be1cb34f881438155eae1825e38c049061f38afb51ff8afda215019dc4c8220ae57a341660dbc746ab9
SSDEEP

1536:z6QFElP6n+gKmddpMOtEvwDpj3GYQbN/PKwNgp699GNtL1e2i:z6a+CdOOtEvwDpjczh

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/4700-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000b00000002320d-13.dat	CryptoLocker_rule2
behavioral2/memory/4700-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4996-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/4700-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x000b00000002320d-13.dat	CryptoLocker_set1
behavioral2/memory/4700-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4996-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/4700-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x000b00000002320d-13.dat	UPX
behavioral2/memory/4700-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4996-26-0x0000000000500000-0x0000000000510000-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-1-5-21-557049126-2506969350-2798870634-1000\Control Panel\International\Geo\Nation	2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
4996	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4700-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x000b00000002320d-13.dat	upx
behavioral2/memory/4700-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4996-26-0x0000000000500000-0x0000000000510000-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 4700 wrote to memory of 4996	4700	2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe	88
PID 4700 wrote to memory of 4996	4700	2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe	88
PID 4700 wrote to memory of 4996	4700	2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe	88

C:\Users\Admin\AppData\Local\Temp\2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-03-27_f23741f0ee2f9ea1991d62b51730e2b2_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4700
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:4996

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
149KB

MD5
2b5a04434c8556d6330cc66ea0092897

SHA1
873b31def73c238e0aa48b1405f07b5c589f93b6

SHA256
e4883421b6528d3f3ffb9e1883bb372c409f938cea1291dc583b8f508bdd4156

SHA512
1d13aa5725ce7f6d4d139a891620186372a406bd770a138b31f8fd2e0f9f2180e3c73ec206aff2dae5b32dc619e626e4f908f3e2bff0d0886c060654cccb3b09

Download Submit
memory/4700-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4700-1-0x00000000005C0000-0x00000000005C6000-memory.dmp

Filesize
24KB

Download
memory/4700-2-0x00000000005C0000-0x00000000005C6000-memory.dmp

Filesize
24KB

Download
memory/4700-3-0x0000000002080000-0x0000000002086000-memory.dmp

Filesize
24KB

Download
memory/4700-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4996-21-0x0000000001F50000-0x0000000001F56000-memory.dmp

Filesize
24KB

Download
memory/4996-19-0x0000000001F70000-0x0000000001F76000-memory.dmp

Filesize
24KB

Download
memory/4996-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download