2b76b2fb077a6fbe227ab859739a211e71ef49caa15d6de5ce9693569565b7ec

Analysis

max time kernel
141s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
23-05-2024 02:50

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General

Target

2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exe
Size

71KB
MD5

ff137592acd8b7d67b31b5be1e7e30c3
SHA1

7f48eca3784bc732ae096af820e992278070f84e
SHA256

2b76b2fb077a6fbe227ab859739a211e71ef49caa15d6de5ce9693569565b7ec
SHA512

b353ac108c79209344bfc310762d4116ce597f6f35ea2acf2ddb24f294ff0893509a1406f819878db6073ff9f6699ba753fd984fcbdfaecc34f0aac47f36ea39
SSDEEP

1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazT1:ZRpAyazIliazT1

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

CTS.exe

pid process

4536 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
4536	CTS.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exeCTS.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe"	2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_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:

2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exeCTS.exe

description ioc process

File created C:\Windows\CTS.exe 2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exe
File created C:\Windows\CTS.exe CTS.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exeCTS.exe

description pid process

Token: SeDebugPrivilege 4728 2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exe
Token: SeDebugPrivilege 4536 CTS.exe

description	ioc	process
File created	C:\Windows\CTS.exe	2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

description	pid	process
Token: SeDebugPrivilege	4728	2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exe
Token: SeDebugPrivilege	4536	CTS.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exe

description	pid	process	target process
PID 4728 wrote to memory of 4536	4728	2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exe	CTS.exe
PID 4728 wrote to memory of 4536	4728	2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exe	CTS.exe
PID 4728 wrote to memory of 4536	4728	2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exe	CTS.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-23_ff137592acd8b7d67b31b5be1e7e30c3_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4728

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:4536

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=5292 --field-trial-handle=2280,i,4114443225282860369,4764091921472631035,262144 --variations-seed-version /prefetch:8
1⤵
PID:4764

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml
Filesize
789KB

MD5
064e5c4413770bb9de419da9ca4e1acf

SHA1
c1f6e4bb6463309772ea743913c0ebe5aa5fd985

SHA256
26c696b44c234f9743502b2c22c5258f9dd85ecae1e4a54f348c318123fc03d8

SHA512
3e03a8fdbc9771b73feb1ed54cdddc62d56c74a9526ab2fc3320200cfbcbf653a151237c439dcd85ba2039d6e307227b4239e389887d83bdb95933b53dcb67fd

Download Submit
C:\Users\Admin\AppData\Local\Temp\DPb4hvHcdDJ7E2M.exe
Filesize
71KB

MD5
990cdbb369e660ea4842fcbdae5292af

SHA1
9656a5479469750dfdb039e86d43ba2ae6856f55

SHA256
937c52bab59701ab5c75f2e67d192944f605de8163ca1aa92eaebaeaaa9bf59c

SHA512
c578f7cefc59de72e8a34b941ac77534e52f7d3aee3ab08006edda04829d1def7bb04a746510419da7f3ed0de1aca6dc8a6732a46f4fd95642385cc3fd963242

Download Submit
C:\Windows\CTS.exe
Filesize
71KB

MD5
f9d4ab0a726adc9b5e4b7d7b724912f1

SHA1
3d42ca2098475924f70ee4a831c4f003b4682328

SHA256
b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

SHA512
22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

Download Submit