b843bb066756b44aaa7b6d79587604f7095a54a2afcdf113e3d341aecd88ac80

General

Target

2024-03-12_fd4b47312beb79ad78fe75d8ccd589fe_cryptolocker.exe
Size

56KB
MD5

fd4b47312beb79ad78fe75d8ccd589fe
SHA1

ab6fd80780032d01e4d823ac581ebcefb0a20809
SHA256

b843bb066756b44aaa7b6d79587604f7095a54a2afcdf113e3d341aecd88ac80
SHA512

fc8b8baf901a440b4374d2dcf712a4e5325599cc820cc9857d46a10cb4a3b2d8b7e89ff3e9a30cd3073ad353a73e627b7c876f7fa0b3ce0daf0e494d8027c599
SSDEEP

768:z6LsoEEeegiZPvEhHSG+gzum/kLyMro2GtOOtEvwDpj/YMLam5ax8iHn:z6QFElP6n+gKmddpMOtEvwDpj9aYa9n

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/3868-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000800000002330f-13.dat	CryptoLocker_rule2
behavioral2/memory/5112-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3868-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/5112-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/3868-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x000800000002330f-13.dat	CryptoLocker_set1
behavioral2/memory/5112-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3868-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/5112-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/3868-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x000800000002330f-13.dat	UPX
behavioral2/memory/5112-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/3868-19-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/5112-27-0x0000000000500000-0x0000000000510000-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-1-5-21-1904519900-954640453-4250331663-1000\Control Panel\International\Geo\Nation	2024-03-12_fd4b47312beb79ad78fe75d8ccd589fe_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
5112	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3868-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x000800000002330f-13.dat	upx
behavioral2/memory/5112-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/3868-19-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/5112-27-0x0000000000500000-0x0000000000510000-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 3868 wrote to memory of 5112	3868	2024-03-12_fd4b47312beb79ad78fe75d8ccd589fe_cryptolocker.exe	94
PID 3868 wrote to memory of 5112	3868	2024-03-12_fd4b47312beb79ad78fe75d8ccd589fe_cryptolocker.exe	94
PID 3868 wrote to memory of 5112	3868	2024-03-12_fd4b47312beb79ad78fe75d8ccd589fe_cryptolocker.exe	94

C:\Users\Admin\AppData\Local\Temp\2024-03-12_fd4b47312beb79ad78fe75d8ccd589fe_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-03-12_fd4b47312beb79ad78fe75d8ccd589fe_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3868
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:5112

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=3708 --field-trial-handle=2284,i,2771196087253062161,8107167670425198948,262144 --variations-seed-version /prefetch:8
1⤵
PID:652

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
56KB

MD5
fac1f3a36e2f78157940f5c7e65e1b50

SHA1
816bf699fe5d04266e316b46821a3051d34f6f2e

SHA256
6584a840006a0d381403bd46e2a037ef6f9f6bc94759005d740b404decc8e697

SHA512
c6cbc5a15f10ae7a2fce2f3136af5f9614cf555674dae014320de865471c65417169ebdf4a6dd2cd768f2e66282ae6915481dd9c8f0e362c63bbad76a28a1659

Download Submit
memory/3868-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/3868-1-0x00000000005B0000-0x00000000005B6000-memory.dmp

Filesize
24KB

Download
memory/3868-2-0x00000000005B0000-0x00000000005B6000-memory.dmp

Filesize
24KB

Download
memory/3868-3-0x0000000002070000-0x0000000002076000-memory.dmp

Filesize
24KB

Download
memory/3868-19-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/5112-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/5112-20-0x0000000002090000-0x0000000002096000-memory.dmp

Filesize
24KB

Download
memory/5112-22-0x0000000002060000-0x0000000002066000-memory.dmp

Filesize
24KB

Download
memory/5112-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

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