671d31d0a52dfd60edb5a19cda0e1e486ef20bd920171db1427ec3e4bc4f1b25

Analysis

max time kernel
119s
max time network
124s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
25/04/2024, 18:27

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General

Target

2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe
Size

131KB
MD5

5d212d2ee06adf6387cb52f658bf83ad
SHA1

ab437087ac4317ad1c579f77942c6b39e55e7a61
SHA256

671d31d0a52dfd60edb5a19cda0e1e486ef20bd920171db1427ec3e4bc4f1b25
SHA512

bd0aa3a78863f28173902745f94c49cf57c4d2f808b1a41431d51236e9d64611772dbf2442f8c543ec78be493d89aa82f4fd8fbe4c05218dc616f0da65c30606
SSDEEP

3072:ZRpAyazIliazTrwNszt0kJ6y1s/NWnxWS1uRWiW7xd:xZ8azQNct0Py1s/2duIP

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 2 IoCs

pid	Process
2152	MkNwZm41oAD8Csr.exe
2616	CTS.exe

Loads dropped DLL 2 IoCs

pid	Process
1400	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe
1400	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.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

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe"	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_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

description	ioc	Process
File created	C:\Windows\CTS.exe	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1400	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe
Token: SeDebugPrivilege	2616	CTS.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1400 wrote to memory of 2152	1400	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe	28
PID 1400 wrote to memory of 2152	1400	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe	28
PID 1400 wrote to memory of 2152	1400	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe	28
PID 1400 wrote to memory of 2152	1400	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe	28
PID 1400 wrote to memory of 2616	1400	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe	29
PID 1400 wrote to memory of 2616	1400	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe	29
PID 1400 wrote to memory of 2616	1400	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe	29
PID 1400 wrote to memory of 2616	1400	2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe	29

C:\Users\Admin\AppData\Local\Temp\2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-25_5d212d2ee06adf6387cb52f658bf83ad_bkransomware.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1400
- C:\Users\Admin\AppData\Local\Temp\MkNwZm41oAD8Csr.exe
  C:\Users\Admin\AppData\Local\Temp\MkNwZm41oAD8Csr.exe
  2⤵
  - Executes dropped EXE
  PID:2152
- 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:2616

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:\Windows\CTS.exe

Filesize
71KB

MD5
f9d4ab0a726adc9b5e4b7d7b724912f1

SHA1
3d42ca2098475924f70ee4a831c4f003b4682328

SHA256
b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

SHA512
22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

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\Users\Admin\AppData\Local\Temp\MkNwZm41oAD8Csr.exe

Filesize
60KB

MD5
ed0fde686788caec4f2cb1ec9c31680c

SHA1
81ae63b87eaa9fa5637835d2122c50953ae19d34

SHA256
e362670f93cdd952335b1a41e5529f184f2022ea4d41817a9781b150b062511c

SHA512
d90d5e74a9be23816a93490ed30c0aae9f7f038a42bd14aa2ce78e95967b4aabd848f006f00ade619c9976755658d45aa0f5b6d5babbbb2d59a6ed3a3a12ac6b

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads