1621dbc1ba1fb655350be8b062311d823ddf51d9880f0a6d93b58184b46d600e

General

Target

2024-05-31_53a2668143f5e807d3d60adab893e8d3_cryptolocker.exe
Size

90KB
MD5

53a2668143f5e807d3d60adab893e8d3
SHA1

5060b5ffee8d8d20b803eafc3f9c33f27cf0eb5a
SHA256

1621dbc1ba1fb655350be8b062311d823ddf51d9880f0a6d93b58184b46d600e
SHA512

efd5e21570a51c1689a149de058e058130ca4e828d9b2cc2b0dbcf3d0a688e13ab946ee7272321ed1ad2466b76787e29455052f4b9a54143112b13acd8d52221
SSDEEP

1536:n6QFElP6n+g9u9cvMOtEvwDpjYYTjipvF2bx1PQAyE:n6a+1SEOtEvwDpjYYvQd2PN

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/3796-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x00090000000235bb-13.dat	CryptoLocker_rule2
behavioral2/memory/2784-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3796-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2784-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/3796-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x00090000000235bb-13.dat	CryptoLocker_set1
behavioral2/memory/2784-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3796-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2784-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/3796-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x00090000000235bb-13.dat	UPX
behavioral2/memory/2784-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/3796-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2784-27-0x0000000000500000-0x0000000000510000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	2024-05-31_53a2668143f5e807d3d60adab893e8d3_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
2784	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3796-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x00090000000235bb-13.dat	upx
behavioral2/memory/2784-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/3796-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2784-27-0x0000000000500000-0x0000000000510000-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 3796 wrote to memory of 2784	3796	2024-05-31_53a2668143f5e807d3d60adab893e8d3_cryptolocker.exe	90
PID 3796 wrote to memory of 2784	3796	2024-05-31_53a2668143f5e807d3d60adab893e8d3_cryptolocker.exe	90
PID 3796 wrote to memory of 2784	3796	2024-05-31_53a2668143f5e807d3d60adab893e8d3_cryptolocker.exe	90

C:\Users\Admin\AppData\Local\Temp\2024-05-31_53a2668143f5e807d3d60adab893e8d3_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-31_53a2668143f5e807d3d60adab893e8d3_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3796
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:2784

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4048,i,15140928051103392835,1612840580898364401,262144 --variations-seed-version --mojo-platform-channel-handle=4836 /prefetch:8
1⤵
PID:1904

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

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
91KB

MD5
0d3b122650833e4e59e188ea7c642d53

SHA1
b7fc5a0bd3d5496810288083b84aad3f540fba17

SHA256
f9c704a5956a4d701acf043e9289d738892871ee3aefe0fe4898022a1491cd5c

SHA512
9a3db6485db9c8928a5b3bc654652ba4460ab1a6dbedc9cb4efcdc02a943160aba18d064e6e22edbe24267ffd4e058588ae237254f4f35a13140d8010780de1c

Download Submit
memory/2784-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2784-20-0x00000000006E0000-0x00000000006E6000-memory.dmp

Filesize
24KB

Download
memory/2784-26-0x00000000006C0000-0x00000000006C6000-memory.dmp

Filesize
24KB

Download
memory/2784-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3796-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3796-1-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/3796-3-0x00000000004F0000-0x00000000004F6000-memory.dmp

Filesize
24KB

Download
memory/3796-9-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/3796-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

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