36d40aa5d4d782c4a7d506fb0ec449a4101fb03abe3b7b6a3f087b75a769e74d

General

Target

2024-06-07_78b41ce866532b84a97713e575b70532_cryptolocker.exe
Size

90KB
MD5

78b41ce866532b84a97713e575b70532
SHA1

78dbd1de41c2477705569f548af775cd98d8e9fd
SHA256

36d40aa5d4d782c4a7d506fb0ec449a4101fb03abe3b7b6a3f087b75a769e74d
SHA512

84db5849e12566a73db0279ea4b7dff29540f71227f2d99fdc7fb51b6e37d40d3ae1e876e9ceb067a5ba6ee493d6df2698a750ebffbde93aecbc42ae207d1149
SSDEEP

1536:n6QFElP6n+g9u9cvMOtEvwDpjYYTjipvF2bx1PQAk:n6a+1SEOtEvwDpjYYvQd2Pk

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/2308-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x00090000000235f1-13.dat	CryptoLocker_rule2
behavioral2/memory/2308-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/5064-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/5064-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/2308-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x00090000000235f1-13.dat	CryptoLocker_set1
behavioral2/memory/2308-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/5064-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/5064-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/2308-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x00090000000235f1-13.dat	UPX
behavioral2/memory/2308-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/5064-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/5064-27-0x0000000000500000-0x0000000000510000-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	2024-06-07_78b41ce866532b84a97713e575b70532_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
5064	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2308-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x00090000000235f1-13.dat	upx
behavioral2/memory/2308-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/5064-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/5064-27-0x0000000000500000-0x0000000000510000-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 2308 wrote to memory of 5064	2308	2024-06-07_78b41ce866532b84a97713e575b70532_cryptolocker.exe	90
PID 2308 wrote to memory of 5064	2308	2024-06-07_78b41ce866532b84a97713e575b70532_cryptolocker.exe	90
PID 2308 wrote to memory of 5064	2308	2024-06-07_78b41ce866532b84a97713e575b70532_cryptolocker.exe	90

C:\Users\Admin\AppData\Local\Temp\2024-06-07_78b41ce866532b84a97713e575b70532_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-06-07_78b41ce866532b84a97713e575b70532_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2308
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:5064

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=3756,i,9746875443948590908,1444894342962555245,262144 --variations-seed-version --mojo-platform-channel-handle=4232 /prefetch:8
1⤵
PID:2800

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
90KB

MD5
5e666a6427ffd275a2b58e1d6f02ae55

SHA1
dac44bef9414abe75bc27fa3ea8b5819161b7ac6

SHA256
ca795ab058aefccfcaba680b82fcf87b88ae6c096faa9b78ad88783420e7318d

SHA512
97e1db439a0110fc98d778213c8aa416d9cb85ef7bf59c0f15a5fc56c37816ea5a842707c1ddc02b58563290c59345fdc1625d4daaa732f36809baf3e6cefbdc

Download Submit
memory/2308-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2308-1-0x0000000002050000-0x0000000002056000-memory.dmp

Filesize
24KB

Download
memory/2308-2-0x0000000002070000-0x0000000002076000-memory.dmp

Filesize
24KB

Download
memory/2308-9-0x0000000002050000-0x0000000002056000-memory.dmp

Filesize
24KB

Download
memory/2308-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/5064-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/5064-20-0x0000000001F70000-0x0000000001F76000-memory.dmp

Filesize
24KB

Download
memory/5064-26-0x0000000000530000-0x0000000000536000-memory.dmp

Filesize
24KB

Download
memory/5064-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

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