53bac53494fe68e20c82efa3f92d46af0b8edd1035d2d0d1ce93bcfd9edc56b6

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
28-04-2024 19:32

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General

Target

2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exe
Size

71KB
MD5

b721aa13ce81d30b1e41970654f4dca5
SHA1

debee326f94409d59a71d9b84111637f25b41489
SHA256

53bac53494fe68e20c82efa3f92d46af0b8edd1035d2d0d1ce93bcfd9edc56b6
SHA512

9dc7be16fcc02d4b933d5ed9695ff42a3aa5ba6b6dc4ef0da8dff9b7cc87f2a6111caa1660af258bc1aa5be28da07e9f1180eec53061d03c73c1cda642967b18
SSDEEP

1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTe:ZRpAyazIliazTe

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

CTS.exe

pid process

4576 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
4576	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_b721aa13ce81d30b1e41970654f4dca5_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_b721aa13ce81d30b1e41970654f4dca5_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_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exeCTS.exe

description ioc process

File created C:\Windows\CTS.exe 2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exe
File created C:\Windows\CTS.exe CTS.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exeCTS.exe

description pid process

Token: SeDebugPrivilege 2708 2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exe
Token: SeDebugPrivilege 4576 CTS.exe

description	ioc	process
File created	C:\Windows\CTS.exe	2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

description	pid	process
Token: SeDebugPrivilege	2708	2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exe
Token: SeDebugPrivilege	4576	CTS.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exe

description	pid	process	target process
PID 2708 wrote to memory of 4576	2708	2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exe	CTS.exe
PID 2708 wrote to memory of 4576	2708	2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exe	CTS.exe
PID 2708 wrote to memory of 4576	2708	2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exe	CTS.exe

C:\Users\Admin\AppData\Local\Temp\2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-28_b721aa13ce81d30b1e41970654f4dca5_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2708
- 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:4576

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

Replay Monitor

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Downloads

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

Filesize
392KB

MD5
5c2512f9ab535b334dac975be9a2788c

SHA1
7c0cdbe8fd65931ccc154cc6ea562613f8ea0b33

SHA256
236368fe0881927fa646f7ad3074580150deca2105af67b36d1eeda2f3d83bb6

SHA512
285039202f3c4d51e4f955d983f1d53ca7e2accb3637db279b5963b71e92686276845238a2fcc295c339b7d148af227246e5bbb4e9f4bef88c8346daef8e8d4e

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C:\Users\Admin\AppData\Local\Temp\rggcrQIXt972Z7k.exe

Filesize
71KB

MD5
1e23d507877f868b1168d9c825ac6fdc

SHA1
3235e56ee676c623f38e18dfdb769b47491d846b

SHA256
520fb1f236963bdf36b77a365ba364b7878899e9d2ad66e5c3aff781b842be78

SHA512
7bef7b33a27d87e2ceed1c9fa43b880437966b81ff52e74195e3ed9876dc5d69465beb56accaed4188c4e8b55e56399a0bce346a91978df3487dd69c47a4b3d1

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C:\Windows\CTS.exe

Filesize
71KB

MD5
f9d4ab0a726adc9b5e4b7d7b724912f1

SHA1
3d42ca2098475924f70ee4a831c4f003b4682328

SHA256
b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

SHA512
22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

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