de4a3ea033e196c9ddeecd7d5a92dd2fd4967b207dce39a81cf75eb9b963ecd3

General

Target

2024-03-14_a5784ae3f3f0da038cc90e355d57be75_cryptolocker.exe
Size

57KB
MD5

a5784ae3f3f0da038cc90e355d57be75
SHA1

0f4c06538782d54319e56c4865a997c7b3085f8d
SHA256

de4a3ea033e196c9ddeecd7d5a92dd2fd4967b207dce39a81cf75eb9b963ecd3
SHA512

edde0cd1622b85d2aa171abd00a9b0a389d10cb225de872d5639fd4ab71d25739553d8dc710d49dc5c261fe6996ffe7b556843e25a79c61faca2d2bfced2c315
SSDEEP

768:z6LsoEEeegiZPvEhHSG+gzum/kLyMro2GtOOtEvwDpj/YMLam5appr:z6QFElP6n+gKmddpMOtEvwDpj9aYa7

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/4512-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000900000002326d-13.dat	CryptoLocker_rule2
behavioral2/memory/1364-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4512-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1364-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/4512-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x000900000002326d-13.dat	CryptoLocker_set1
behavioral2/memory/1364-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4512-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1364-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/4512-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x000900000002326d-13.dat	UPX
behavioral2/memory/1364-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4512-26-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/1364-27-0x0000000000500000-0x0000000000510000-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-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	2024-03-14_a5784ae3f3f0da038cc90e355d57be75_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
1364	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4512-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x000900000002326d-13.dat	upx
behavioral2/memory/1364-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4512-26-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/1364-27-0x0000000000500000-0x0000000000510000-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 4512 wrote to memory of 1364	4512	2024-03-14_a5784ae3f3f0da038cc90e355d57be75_cryptolocker.exe	96
PID 4512 wrote to memory of 1364	4512	2024-03-14_a5784ae3f3f0da038cc90e355d57be75_cryptolocker.exe	96
PID 4512 wrote to memory of 1364	4512	2024-03-14_a5784ae3f3f0da038cc90e355d57be75_cryptolocker.exe	96

C:\Users\Admin\AppData\Local\Temp\2024-03-14_a5784ae3f3f0da038cc90e355d57be75_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-03-14_a5784ae3f3f0da038cc90e355d57be75_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4512
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:1364

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 --mojo-platform-channel-handle=1424 --field-trial-handle=2180,i,12780723798465539942,12010519452607841069,262144 --variations-seed-version /prefetch:8
1⤵
PID:684

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
58KB

MD5
9670e5245ced4c47c83057175e854b64

SHA1
e8ff6b209bfb164aa0d5d8af82197330977f5132

SHA256
c58e4d1b8d1bffc821112dddc016094c618dd65c3ffe3bfa64bc1417696a21ce

SHA512
0e0645bf81dd653e14ccbcedea1f30e35318b57474146fdb8624019b2293617bab6c7855e7e2cc1aa22b224881d5d4479db34f02bde65c2385b9678faa87592b

Download Submit
memory/1364-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1364-19-0x0000000000660000-0x0000000000666000-memory.dmp

Filesize
24KB

Download
memory/1364-20-0x0000000000750000-0x0000000000756000-memory.dmp

Filesize
24KB

Download
memory/1364-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4512-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4512-1-0x0000000000730000-0x0000000000736000-memory.dmp

Filesize
24KB

Download
memory/4512-2-0x0000000000730000-0x0000000000736000-memory.dmp

Filesize
24KB

Download
memory/4512-3-0x00000000020F0000-0x00000000020F6000-memory.dmp

Filesize
24KB

Download
memory/4512-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

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