ae0c031d2ef7fc3d45398c0f06731471f87b9dfe18be8cd7f5ebde550c9f09cb

Analysis

max time kernel
148s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
23-05-2024 00:54

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General

Target

2024-05-23_cfff8ff2f822f99920d97ae94a8d3e87_cryptolocker.exe
Size

40KB
MD5

cfff8ff2f822f99920d97ae94a8d3e87
SHA1

37df2aa4d6d2caebfa443cf61f6db7628f3a916d
SHA256

ae0c031d2ef7fc3d45398c0f06731471f87b9dfe18be8cd7f5ebde550c9f09cb
SHA512

b83e5fa125523d571fb33fcf20e618b1a1d02a827bc7176b6df325f6c91742479f43523e09dc374a838db5cdfc93b2825b5e8a8b160c8f87fc2f59189598ba6b
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYaBcF:qDdFJy3QMOtEvwDpjjWMl7Td+

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1312-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/1312-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4872-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4872-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1312-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/1312-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4872-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4872-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1312-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/1312-19-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4872-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4872-28-0x0000000000500000-0x0000000000510000-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:

2024-05-23_cfff8ff2f822f99920d97ae94a8d3e87_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-540404634-651139247-2967210625-1000\Control Panel\International\Geo\Nation	2024-05-23_cfff8ff2f822f99920d97ae94a8d3e87_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

4872 asih.exe

pid	process
4872	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/1312-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/1312-19-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4872-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4872-28-0x0000000000500000-0x0000000000510000-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 3 IoCs

Processes:

2024-05-23_cfff8ff2f822f99920d97ae94a8d3e87_cryptolocker.exe

description	pid	process	target process
PID 1312 wrote to memory of 4872	1312	2024-05-23_cfff8ff2f822f99920d97ae94a8d3e87_cryptolocker.exe	asih.exe
PID 1312 wrote to memory of 4872	1312	2024-05-23_cfff8ff2f822f99920d97ae94a8d3e87_cryptolocker.exe	asih.exe
PID 1312 wrote to memory of 4872	1312	2024-05-23_cfff8ff2f822f99920d97ae94a8d3e87_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-23_cfff8ff2f822f99920d97ae94a8d3e87_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-23_cfff8ff2f822f99920d97ae94a8d3e87_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1312

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:4872

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe
Filesize
40KB

MD5
ae52280a09d1c38f2edc8cabd89fafd8

SHA1
46d92e9bd1d070e5eb29ce87598c326486807841

SHA256
85f85823227fb290a73c157abdb8a7818d69a67bcdd9025a31703b3d029482d8

SHA512
22d9ba0e28af2ef2e68e1808dcb2e5dc90ebd725b262b4a95557de2ba6c287e18e22a14fa0938d47af243232ea0cfdb0d60a2f61616ee8d08c2bd6dda22c9471

Download Submit
memory/1312-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1312-2-0x00000000020F0000-0x00000000020F6000-memory.dmp

Filesize
24KB

Download
memory/1312-1-0x0000000000660000-0x0000000000666000-memory.dmp

Filesize
24KB

Download
memory/1312-9-0x0000000000660000-0x0000000000666000-memory.dmp

Filesize
24KB

Download
memory/1312-19-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4872-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4872-21-0x0000000001FF0000-0x0000000001FF6000-memory.dmp

Filesize
24KB

Download
memory/4872-27-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/4872-28-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download