5d5353f87dcba460e95d72898d972f60b498eef5bc6f4b24266fd8f18e093abc

Analysis

max time kernel
131s
max time network
101s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
27-05-2024 06:22

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General

Target

2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe
Size

96KB
MD5

0a99b7c73b6356877ab94151e3dbdb95
SHA1

5ac10d271f3eb8ebe5f0c6b8d4b050631131c40b
SHA256

5d5353f87dcba460e95d72898d972f60b498eef5bc6f4b24266fd8f18e093abc
SHA512

b37cf2e62d314c5e86064d0179c6cc686d7ae9aea8c3ad049ab5175dcc5cb50aa4739bb89c2ca63906d75a15fdd3113aa4f56e788098f0fbfdbe82c1d074b564
SSDEEP

1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTWN+bL/gfLJ:ZRpAyazIliazTWW/gfLJ

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 2 IoCs

Processes:

tbZ4zLMfHa3ievQ.exeCTS.exe

pid process

1408 tbZ4zLMfHa3ievQ.exe
3804 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
1408	tbZ4zLMfHa3ievQ.exe
3804	CTS.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exeCTS.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe"	2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_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:

2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exeCTS.exe

description ioc process

File created C:\Windows\CTS.exe 2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe
File created C:\Windows\CTS.exe CTS.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exeCTS.exe

description pid process

Token: SeDebugPrivilege 2648 2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe
Token: SeDebugPrivilege 3804 CTS.exe

description	ioc	process
File created	C:\Windows\CTS.exe	2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

description	pid	process
Token: SeDebugPrivilege	2648	2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe
Token: SeDebugPrivilege	3804	CTS.exe

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe

description	pid	process	target process
PID 2648 wrote to memory of 1408	2648	2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe	tbZ4zLMfHa3ievQ.exe
PID 2648 wrote to memory of 1408	2648	2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe	tbZ4zLMfHa3ievQ.exe
PID 2648 wrote to memory of 3804	2648	2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe	CTS.exe
PID 2648 wrote to memory of 3804	2648	2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe	CTS.exe
PID 2648 wrote to memory of 3804	2648	2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe	CTS.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-27_0a99b7c73b6356877ab94151e3dbdb95_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2648

C:\Users\Admin\AppData\Local\Temp\tbZ4zLMfHa3ievQ.exe
C:\Users\Admin\AppData\Local\Temp\tbZ4zLMfHa3ievQ.exe
2⤵
- Executes dropped EXE
PID:1408

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:3804

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml
Filesize
394KB

MD5
e1758f5457d71756bc8b49514bd1f14f

SHA1
cb4a502b1c760d228e753c3eefff3fc50036afa0

SHA256
79766eeda3a7d23cb79b0e805aac073f2f00a52f018b94e53f560b2f0d142bba

SHA512
1b4fe4ee8f5024c67ccd13abd40568b4da59e3aac02453e3f4827c4237d0c5ebc8a8e1b5a1bc59497f7dcf8a75780964d25de79a9cf3a871d07644cdfce2ddcb

Download Submit
C:\Users\Admin\AppData\Local\Temp\tbZ4zLMfHa3ievQ.exe
Filesize
25KB

MD5
abbd49c180a2f8703f6306d6fa731fdc

SHA1
d63f4bfe7f74936b2fbace803e3da6103fbf6586

SHA256
5f411c0bd9ed9a42b0f07ed568c7d0cf358a83063b225a1f8f7da3296dde90f1

SHA512
290dd984acc451b778f3db8c510bae7aec1d9547c3ad0a1829df731c136e4ecc9a37dc6a786cf8f1ecc4d14339aed1288af25055f450f6f953138c8d4d5c36e9

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

MD5
f9d4ab0a726adc9b5e4b7d7b724912f1

SHA1
3d42ca2098475924f70ee4a831c4f003b4682328

SHA256
b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

SHA512
22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

Download Submit
memory/1408-14-0x0000000000400000-0x000000000040D000-memory.dmp

Filesize
52KB

Download