cddba3c8a4a64777ae6b8f670475e511293135034417d248a3d0cda640a92e56

General

Target

2024-03-19_271fdc8060c13f023353f4d26e122bd1_cryptolocker.exe
Size

127KB
MD5

271fdc8060c13f023353f4d26e122bd1
SHA1

2c3829bc83c877f3f98132e1597268fa9e5a13b7
SHA256

cddba3c8a4a64777ae6b8f670475e511293135034417d248a3d0cda640a92e56
SHA512

00821d9b21b1508c64075f06b381906ab6ace73d0a5c69cd756eb53518cf311b2fcf8c9b0578d1128cd0bee280347eba60780e021ce6ac3a2086cacaebdc095a
SSDEEP

1536:qkmnpomddpMOtEvwDpjJGYQbN/PKwNgp699GNtL1eIb:AnBdOOtEvwDpj6zq

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/3756-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3756-3-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000a000000016fa5-16.dat	CryptoLocker_rule2
behavioral2/files/0x000a000000016fa5-18.dat	CryptoLocker_rule2
behavioral2/memory/3320-29-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/3756-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3756-3-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x000a000000016fa5-16.dat	CryptoLocker_set1
behavioral2/files/0x000a000000016fa5-18.dat	CryptoLocker_set1
behavioral2/memory/3320-29-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/3756-0-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/3756-3-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/files/0x000a000000016fa5-16.dat	UPX
behavioral2/files/0x000a000000016fa5-18.dat	UPX
behavioral2/memory/3320-29-0x0000000000500000-0x000000000050F000-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	2024-03-19_271fdc8060c13f023353f4d26e122bd1_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
3320	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3756-0-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/3756-3-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/files/0x000a000000016fa5-16.dat	upx
behavioral2/files/0x000a000000016fa5-18.dat	upx
behavioral2/memory/3320-29-0x0000000000500000-0x000000000050F000-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 3756 wrote to memory of 3320	3756	2024-03-19_271fdc8060c13f023353f4d26e122bd1_cryptolocker.exe	102
PID 3756 wrote to memory of 3320	3756	2024-03-19_271fdc8060c13f023353f4d26e122bd1_cryptolocker.exe	102
PID 3756 wrote to memory of 3320	3756	2024-03-19_271fdc8060c13f023353f4d26e122bd1_cryptolocker.exe	102

C:\Users\Admin\AppData\Local\Temp\2024-03-19_271fdc8060c13f023353f4d26e122bd1_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-03-19_271fdc8060c13f023353f4d26e122bd1_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3756
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:3320

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=1412 --field-trial-handle=2256,i,6670388345726423024,18382795228658886258,262144 --variations-seed-version /prefetch:8
1⤵
PID:2804

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

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe

Filesize
109KB

MD5
ffa389b49476c4cbb5660ce17905532e

SHA1
3af7262c82ed3b15cfc271dbaf76a44e4758b21d

SHA256
ffe6a21b961b3d0fce18029cdbf31418c583b882ec75f472cd4a12acf032d892

SHA512
9d36bf1b1867370b82003cc10c5869344b1c8d0f2a21f94f1bce84328bc306ac3dbf6ad78d1a921a7546996b871c695a9706c2b64617ee8002e75b5bec18a64e

Download Submit
C:\Users\Admin\AppData\Local\Temp\asih.exe

Filesize
127KB

MD5
a3ce80974efcd8b04d20f416a0702489

SHA1
846fca245968f7a9aeff186dfea83b707c9890e6

SHA256
bc0cfe36efc01821633e74a4462e59244f0c643de262b964c8e386812b7b0e8e

SHA512
88d184e16b93734e8f0c6b5103d4ce89ac9ec26bb7939865e7d1a05394ac0cd321e3c299d18615af59f8691ffb2b976167e243d507401503cf11d7a7b76fdbf7

Download Submit
memory/3320-21-0x0000000002070000-0x0000000002076000-memory.dmp

Filesize
24KB

Download
memory/3320-27-0x00000000007B0000-0x00000000007B6000-memory.dmp

Filesize
24KB

Download
memory/3320-29-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/3756-0-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/3756-1-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/3756-2-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/3756-3-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/3756-4-0x00000000005C0000-0x00000000005C6000-memory.dmp

Filesize
24KB

Download

Analysis

Sharing