24370a86ad7c51bfa911c4cf35465eeae18b18fce9133d23dc300daa20e244b4

General

Target

2024-05-28_28ec6aafa31e6a1c0cbb2c83c8c00752_cryptolocker.exe
Size

40KB
MD5

28ec6aafa31e6a1c0cbb2c83c8c00752
SHA1

bd3385dcea1aba9f16f11118e8b4bd57edebb710
SHA256

24370a86ad7c51bfa911c4cf35465eeae18b18fce9133d23dc300daa20e244b4
SHA512

c2ac5706da0a9b74e2c8a410ab9ce603342ed8481e5f1dff8daf9234973c3c1083a2bc3e16d0a322bfe4b93eb0c685239c87c53468b654979f3c225554c6eb25
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYf:qDdFJy3QMOtEvwDpjjWMl7TW

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/2704-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x00090000000235b7-13.dat	CryptoLocker_rule2
behavioral2/memory/4628-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2704-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4628-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/2704-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x00090000000235b7-13.dat	CryptoLocker_set1
behavioral2/memory/4628-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2704-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4628-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/2704-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x00090000000235b7-13.dat	UPX
behavioral2/memory/4628-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2704-19-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4628-28-0x0000000000500000-0x0000000000510000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	2024-05-28_28ec6aafa31e6a1c0cbb2c83c8c00752_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
4628	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2704-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x00090000000235b7-13.dat	upx
behavioral2/memory/4628-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2704-19-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4628-28-0x0000000000500000-0x0000000000510000-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

description	pid	Process	procid_target
PID 2704 wrote to memory of 4628	2704	2024-05-28_28ec6aafa31e6a1c0cbb2c83c8c00752_cryptolocker.exe	91
PID 2704 wrote to memory of 4628	2704	2024-05-28_28ec6aafa31e6a1c0cbb2c83c8c00752_cryptolocker.exe	91
PID 2704 wrote to memory of 4628	2704	2024-05-28_28ec6aafa31e6a1c0cbb2c83c8c00752_cryptolocker.exe	91

C:\Users\Admin\AppData\Local\Temp\2024-05-28_28ec6aafa31e6a1c0cbb2c83c8c00752_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-28_28ec6aafa31e6a1c0cbb2c83c8c00752_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2704
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:4628

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=4160,i,11746347647270949551,7786733067759450703,262144 --variations-seed-version --mojo-platform-channel-handle=4288 /prefetch:8
1⤵
PID:848

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
40KB

MD5
989084f6095b8c3d02b1c86addedc49b

SHA1
6e8327ee1c65402c7fe2cdacd85d612f22fb2566

SHA256
57cbb2f559c6962887c008c6be2fa2824655c36fd41f4ef0662fe5fdadb7817e

SHA512
0dda702755a7aeec5d100f371851ec7343f3dc9f4e74e245825e069e713d4d7add950710fb87e45855d6db62ce2a68371145315ab5cd79f246a1b4cf4b876f23

Download Submit
memory/2704-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/2704-1-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/2704-2-0x00000000004F0000-0x00000000004F6000-memory.dmp

Filesize
24KB

Download
memory/2704-9-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/2704-19-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4628-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4628-21-0x00000000006D0000-0x00000000006D6000-memory.dmp

Filesize
24KB

Download
memory/4628-27-0x0000000000660000-0x0000000000666000-memory.dmp

Filesize
24KB

Download
memory/4628-28-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

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