634104ece30c02e7c436b68fc397295569ef69b9e8c76d353b000181423bb7bf

Analysis

max time kernel
141s
max time network
158s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
28-04-2024 01:47

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General

Target

2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe
Size

71KB
MD5

f51d639c5486aa1f8e3efc5687dfa1e7
SHA1

5bd3a24b3adbba0a9020d71fa4470d230348c72e
SHA256

634104ece30c02e7c436b68fc397295569ef69b9e8c76d353b000181423bb7bf
SHA512

32f92021bfe82f421bfed0ade5d5a7bc2e6f2626ae4d7959ab28e0da8d9ef8aea7948bdb0badd87a9ab2e59aa8c1340ab09dc050d7cd586ad2816b11520a6645
SSDEEP

1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTFL:ZRpAyazIliazTFL

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

CTS.exe

pid process

1868 CTS.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

pid	process
1868	CTS.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exeCTS.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe"	2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe"	CTS.exe

Drops file in Windows directory 2 IoCs

Processes:

2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exeCTS.exe

description ioc process

File created C:\Windows\CTS.exe 2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe
File created C:\Windows\CTS.exe CTS.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exeCTS.exe

description pid process

Token: SeDebugPrivilege 3016 2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe
Token: SeDebugPrivilege 1868 CTS.exe

description	ioc	process
File created	C:\Windows\CTS.exe	2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

description	pid	process
Token: SeDebugPrivilege	3016	2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe
Token: SeDebugPrivilege	1868	CTS.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe

description	pid	process	target process
PID 3016 wrote to memory of 1868	3016	2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe	CTS.exe
PID 3016 wrote to memory of 1868	3016	2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe	CTS.exe
PID 3016 wrote to memory of 1868	3016	2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe	CTS.exe

C:\Users\Admin\AppData\Local\Temp\2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-28_f51d639c5486aa1f8e3efc5687dfa1e7_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3016

C:\Windows\CTS.exe
"C:\Windows\CTS.exe"
2⤵
- Executes dropped EXE
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:1868

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=3592 --field-trial-handle=2328,i,5873823382323802923,13134441441264702821,262144 --variations-seed-version /prefetch:8
1⤵
PID:3092

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml

Filesize
789KB

MD5
a28989bdc1395410e56d12a3f9ba28aa

SHA1
b3530a452c9ee6da99824038da8a20ae3ee1c29a

SHA256
dabfe818b52d2dfe0e069a793ed69428811c6173bf323c99ea5b34d06c80ecfc

SHA512
62da3975056a9f4beb991d7fd1d7a963f0921cebf2eb21248b3e916f47891e393c1dd01c28bfa4c9a75d2d90dc98342f28e7505bba2d1728d5d0faa9f9ec087b

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C:\Users\Admin\AppData\Local\Temp\Lh4g3VEeSawlAIh.exe

Filesize
71KB

MD5
ac6d8dfdc339416af54171f633855028

SHA1
60db975f90f2b93a0100570f96fbb5f12613c9b7

SHA256
7a6f46f2e221acb10dbf6807c8bd0bf9b17d78a12064662b027fc91daac534df

SHA512
566faa3c38f5ed224fcf7ef66221210adfaca0906a881851b9f1495c7900884a919db521d13d8106bae47130ee20b04afaa83b29555d1c8c2238d5ced9fe82eb

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C:\Windows\CTS.exe

Filesize
71KB

MD5
f9d4ab0a726adc9b5e4b7d7b724912f1

SHA1
3d42ca2098475924f70ee4a831c4f003b4682328

SHA256
b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

SHA512
22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

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