d8e5a2fb27b5b7a85e29cfc3b4f55212d1b336759f23dbdc125fb09818395298

Analysis

max time kernel
139s
max time network
101s
platform
windows10-2004_x64
resource
win10v2004-20240419-en
resource tags

arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
submitted
30/04/2024, 17:52

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General

Target

2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_bkransomware.exe
Size

257KB
MD5

2c78d384cfcd01e7a63bfb374bd94d99
SHA1

d73491290658ab09a75f9475c7b4f79c59e3069f
SHA256

d8e5a2fb27b5b7a85e29cfc3b4f55212d1b336759f23dbdc125fb09818395298
SHA512

c767acac1e901d0da955aeec2dcd0facb84b182961acfeffe944fb6e2f1100397766b0a414e012b2a283e68173df00324282bb47ec196d4c579118df4c6bfe07
SSDEEP

6144:xZ8azBpvsa0E0qcjuwn9uH+u6yZzHD9ID2o58QGm:xC07vgzTjuh5jDbBU

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 2 IoCs

pid	Process
4496	z1sr8jY7bPhJnWV.exe
2824	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"	2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_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	2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2704	2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_bkransomware.exe
Token: SeDebugPrivilege	2824	CTS.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2704 wrote to memory of 4496	2704	2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_bkransomware.exe	84
PID 2704 wrote to memory of 4496	2704	2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_bkransomware.exe	84
PID 2704 wrote to memory of 4496	2704	2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_bkransomware.exe	84
PID 2704 wrote to memory of 2824	2704	2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_bkransomware.exe	85
PID 2704 wrote to memory of 2824	2704	2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_bkransomware.exe	85
PID 2704 wrote to memory of 2824	2704	2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_bkransomware.exe	85

C:\Users\Admin\AppData\Local\Temp\2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-30_2c78d384cfcd01e7a63bfb374bd94d99_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2704
- C:\Users\Admin\AppData\Local\Temp\z1sr8jY7bPhJnWV.exe
  C:\Users\Admin\AppData\Local\Temp\z1sr8jY7bPhJnWV.exe
  2⤵
  - Executes dropped EXE
  PID:4496
- 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:2824

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

Filesize
394KB

MD5
cf06d890f28b42d3c44f2f2914d9fdb4

SHA1
e58903f3324c33adcb90b2413a0d648c83598922

SHA256
df9c6f35af84d5c10e6fbf4988878de52dfc5429538d3dae7537ced9e87da3e6

SHA512
48e7f450f5f39349ccb6f060456d51e21b23c06d60e5b9fd8bfd2f9d0a5657c087065ab15187102b867a573215abff8b10687da9ea3e6d1e48008495b721e23f

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C:\Users\Admin\AppData\Local\Temp\z1sr8jY7bPhJnWV.exe

Filesize
186KB

MD5
2124a793ac7d675e1b2d5fdee19a87d0

SHA1
3a1a6ae7c218e41c4eb303c548db9ec06bd6a6b5

SHA256
1aa3927c7985386d42759656665c7b422ee226df16a19446af6d9a6613b8ae9b

SHA512
d5b7b789108c00901e96a3f336c2176a6e7f50e73cb485974e8bb7af1b513b099e88eb6800ed1f0c53969a86a6870130a477c9b17cad0e00f9de4ac90252e051

Download Submit
C:\Windows\CTS.exe

Filesize
71KB

MD5
f9d4ab0a726adc9b5e4b7d7b724912f1

SHA1
3d42ca2098475924f70ee4a831c4f003b4682328

SHA256
b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

SHA512
22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

Download Submit

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads