fb9cc8f51f7c9c13d6833a4909b9041e7ce81bb023051fb43a27d3402d9941fb

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
03/06/2024, 19:01

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General

Target
2024-06-03_8840e550158c5e74cf5fc21c043e67a3_bkransomware.exe
Size 71KB
Sample240603-xpevmsfb91
SHA256 fb9cc8f51f7c9c13d6833a4909b9041e7ce81bb023051fb43a27d3402d9941fb
MD5 8840e550158c5e74cf5fc21c043e67a3
SHA1 e8f527d841cfa4dc34120bced789ff558d9f6882
SHA512 c02e1c5437dc19596433fbe1847d040e599d270f680c83dfaec664c182dead5289dcfc602c65ba649ba6ce4aa26c4376e673b3fce924ce5cdeb330f4afeffc01
SSDEEP 1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTt:ZRpAyazIliazTt
MD5 SHA1 SHA512 SSDEEP

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
3456	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

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"	2024-06-03_8840e550158c5e74cf5fc21c043e67a3_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	2024-06-03_8840e550158c5e74cf5fc21c043e67a3_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	972	2024-06-03_8840e550158c5e74cf5fc21c043e67a3_bkransomware.exe
Token: SeDebugPrivilege	3456	CTS.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 972 wrote to memory of 3456	972	2024-06-03_8840e550158c5e74cf5fc21c043e67a3_bkransomware.exe	82
PID 972 wrote to memory of 3456	972	2024-06-03_8840e550158c5e74cf5fc21c043e67a3_bkransomware.exe	82
PID 972 wrote to memory of 3456	972	2024-06-03_8840e550158c5e74cf5fc21c043e67a3_bkransomware.exe	82

C:\Users\Admin\AppData\Local\Temp\2024-06-03_8840e550158c5e74cf5fc21c043e67a3_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-06-03_8840e550158c5e74cf5fc21c043e67a3_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:972
- 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:3456

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

excel.exe_Rules.xml

Path C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml
Size 394KB
SHA256 26004a7f76abd7e146e9c2bbf48cf503aa674039d2a39a773c3ce943922fe04d
MD5 ff6305ff7043bb0681994a8c8f2722c5
SHA1 cbb175e01a110818ddc6b8ebc0505d83ee3e29aa
SHA512 f39ef7698741ec4df859b44b625c8dd9608521c05b857b12297622e1777a46c41f09772f28469ad0bcf0506a6c48af919b59edd7756ea5993b54d990af2e9347
SSDEEP 12288:xC0B5yODnViILjBqY3IxqYAXoUGt7yYD9m:DOkoj7ASjU
MD5 SHA1 SHA512 SSDEEP

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vFd9k8vW6XaAyoi.exe

Path C:\Users\Admin\AppData\Local\Temp\vFd9k8vW6XaAyoi.exe
Size 71KB
SHA256 748c01477552ee546d59aac4a27fda4ae5c1646ca2df7f0cc0b14b5c93a95778
MD5 470789cf1cb76b15b7108e9b6fafb011
SHA1 50384eba95eda1947ed572d266202cc7038d21bd
SHA512 772565ad9cd6e900ccd30e4a1871434852a740dafc54e39a384e18a9dabf7b5ff32db5f9f3a8d3a6c2b14d4a61e6b62756fe12f8eea539920a925a7402fd157d
SSDEEP 1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTxmM:ZRpAyazIliazTQM
MD5 SHA1 SHA512 SSDEEP

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CTS.exe

Path C:\Windows\CTS.exe
Size 71KB
SHA256 b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
MD5 f9d4ab0a726adc9b5e4b7d7b724912f1
SHA1 3d42ca2098475924f70ee4a831c4f003b4682328
SHA512 22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432
SSDEEP 1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazT:ZRpAyazIliazT
MD5 SHA1 SHA512 SSDEEP

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads