d26c93dc23e24c91c89ad4ae89af091df37a33be8be81b4239b94847b86afeab

Analysis

max time kernel
62s
max time network
51s
platform
windows10-2004_x64
resource
win10v2004-20240419-en
resource tags

arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
submitted
28-04-2024 12:38

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General

Target

2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe
Size

71KB
MD5

7597858998dc4ab96df11320c5ded836
SHA1

11a918ebd7001713372f38cff3cd4efb3f6fc556
SHA256

d26c93dc23e24c91c89ad4ae89af091df37a33be8be81b4239b94847b86afeab
SHA512

c39c7752873cf42d011cf481d93d1fe2da12dc7b20845c3ca924647cca3e8c0485009e9c45ef2391f2c434610a76be23d21dd64c0cc6c9177ee55bb7221a6e2c
SSDEEP

1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazT7:ZRpAyazIliazT7

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

CTS.exe

pid process

752 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
752	CTS.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

CTS.exe2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe"	CTS.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe"	2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe

Drops file in Windows directory 2 IoCs

Processes:

CTS.exe2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe

description ioc process

File created C:\Windows\CTS.exe CTS.exe
File created C:\Windows\CTS.exe 2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exeCTS.exe

description pid process

Token: SeDebugPrivilege 1512 2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe
Token: SeDebugPrivilege 752 CTS.exe

description	ioc	process
File created	C:\Windows\CTS.exe	CTS.exe
File created	C:\Windows\CTS.exe	2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe

description	pid	process
Token: SeDebugPrivilege	1512	2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe
Token: SeDebugPrivilege	752	CTS.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe

description	pid	process	target process
PID 1512 wrote to memory of 752	1512	2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe	CTS.exe
PID 1512 wrote to memory of 752	1512	2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe	CTS.exe
PID 1512 wrote to memory of 752	1512	2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe	CTS.exe

C:\Users\Admin\AppData\Local\Temp\2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-28_7597858998dc4ab96df11320c5ded836_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1512

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:752

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
395KB

MD5
8e63ac5849f69ed03a338c8702bd6c4e

SHA1
6bcf26d1937dc131d8ff4322695938d1b43630fc

SHA256
6df1eadffd012df7f99ea855384d3bc4bbd2bf71bdcab9b68cff7d5cae88ad21

SHA512
c336bcc39dfc351a38b5dd835d4c092dda886750f99537b980733eb0b5d6536a52d6ded0ff24e727523ddf34532c7bbec32cfe6b3d3f38701d806a92020e8815

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C:\Users\Admin\AppData\Local\Temp\Az1Sx8a0GJDFjzk.exe
Filesize
71KB

MD5
9ad4b364d281269b4c95eca6f8cd2ff9

SHA1
7933fd9234ec1bb39882c96654d81e26160e72d7

SHA256
7fb39ddaf69fc83adf8b101c4775922859da4f745c3f48ef78a5cc97078418f7

SHA512
10f8d51b4f8e5051a61a9165f3eb6bec51a52121d0ba8da387fa542ca50f4f1c6091877422912c09974899b9e2f09241060596bf919ad1f24709419cd3a3b1b8

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C:\Windows\CTS.exe
Filesize
71KB

MD5
f9d4ab0a726adc9b5e4b7d7b724912f1

SHA1
3d42ca2098475924f70ee4a831c4f003b4682328

SHA256
b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

SHA512
22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

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