d20e10bacc80335e1b351fe03ac7bd0ba8dccb149b6cdaa477ead6a3e89f3e52

Analysis

max time kernel
66s
max time network
52s
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 01:44

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General

Target

2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exe
Size

71KB
MD5

d05a4b4a32947291a34ecfd6225b6b5a
SHA1

c3cc65f1bfa3b7e0b7de8810355719b2aed76fef
SHA256

d20e10bacc80335e1b351fe03ac7bd0ba8dccb149b6cdaa477ead6a3e89f3e52
SHA512

32c7afcfaa3c68b0b9cff5168b7728dc06f67c089e94bc4b6ceed28053f892451e57e726c6233cff9bb16679af0ffcb9bb95a26b286f4350bd570760ec151933
SSDEEP

1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTP:ZRpAyazIliazTP

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

CTS.exe

pid process

1936 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
1936	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_d05a4b4a32947291a34ecfd6225b6b5a_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_d05a4b4a32947291a34ecfd6225b6b5a_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_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exeCTS.exe

description ioc process

File created C:\Windows\CTS.exe 2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exe
File created C:\Windows\CTS.exe CTS.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exeCTS.exe

description pid process

Token: SeDebugPrivilege 3600 2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exe
Token: SeDebugPrivilege 1936 CTS.exe

description	ioc	process
File created	C:\Windows\CTS.exe	2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

description	pid	process
Token: SeDebugPrivilege	3600	2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exe
Token: SeDebugPrivilege	1936	CTS.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exe

description	pid	process	target process
PID 3600 wrote to memory of 1936	3600	2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exe	CTS.exe
PID 3600 wrote to memory of 1936	3600	2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exe	CTS.exe
PID 3600 wrote to memory of 1936	3600	2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exe	CTS.exe

C:\Users\Admin\AppData\Local\Temp\2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-28_d05a4b4a32947291a34ecfd6225b6b5a_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3600

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:1936

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
394KB

MD5
d1ddb66bcf9f0bcf2c07ffe780e46487

SHA1
9320e7b95acf88ea20d6c25e8d6706d0fb7f33ee

SHA256
003e02bd8ee74551d0beb66323485deea6816e64428df9077869de708585b062

SHA512
4720330792bd459b0c579979899c2dcec87cc6151cc7af2f178812e91d1d2a5cc8831757e78cf427cf04c7a2dfb4c3e652f33038b465df88a6c70b2e34a8cca9

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C:\Users\Admin\AppData\Local\Temp\AANMdmsTNf2kvBc.exe

Filesize
71KB

MD5
676d587fb4ace05b55fb46ddb2c48157

SHA1
bffb6d20ec84ea8e95a581ed8216711ec8ed359e

SHA256
10aac9e00a41e9b832e22c2b2b9c86c2f9607e07186d9fd7f624230a2ba3a6f6

SHA512
259cf24d7273e00ea24b8e73e2141c72bfdb0008c4b475db9665c7989aceaa0ce0933d7c7cccbbb6e96d2de3acc42bfa80216689d7b63594e7341f7f95e04abd

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C:\Windows\CTS.exe

Filesize
71KB

MD5
f9d4ab0a726adc9b5e4b7d7b724912f1

SHA1
3d42ca2098475924f70ee4a831c4f003b4682328

SHA256
b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

SHA512
22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

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