4793380fe37d83f037465b6af4f0d3505679aab76ebe919e49e7eb2a43ec4f2c

General

Target

2024-04-28_f826928418350daed0959b6fe5837208_bkransomware.exe
Size

11.8MB
MD5

f826928418350daed0959b6fe5837208
SHA1

5a56cdc748dfb2ba91859f47e7e105ac36fe4654
SHA256

4793380fe37d83f037465b6af4f0d3505679aab76ebe919e49e7eb2a43ec4f2c
SHA512

b7df8ceb0a66bcace5c5d912c19528c25a9742d956b7744fd733adeccb1d48fa22d7d5f60030356384e435cdb8cdd75e1523afd54707792107a728a1ac0b8f88
SSDEEP

196608:h+cpkunept7RjSs9B3XpknY7RU1v5mifvMx3hhF3h8TtHeEGCnhGMwL/drW:h+cpzneprzjZr8pfwdaBevMwL/JW

Score

7^/10

Malware Config

Signatures

Executes dropped EXE 2 IoCs

pid	Process
4036	QwtoUzWytMxpn9D.exe
1680	CTS.exe

Loads dropped DLL 5 IoCs

pid	Process
4036	QwtoUzWytMxpn9D.exe
4036	QwtoUzWytMxpn9D.exe
4036	QwtoUzWytMxpn9D.exe
4036	QwtoUzWytMxpn9D.exe
4036	QwtoUzWytMxpn9D.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"	2024-04-28_f826928418350daed0959b6fe5837208_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	2024-04-28_f826928418350daed0959b6fe5837208_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

NSIS installer 2 IoCs

installer

resource	yara_rule
behavioral2/files/0x000800000002327d-2.dat	nsis_installer_1
behavioral2/files/0x000800000002327d-2.dat	nsis_installer_2

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3728	2024-04-28_f826928418350daed0959b6fe5837208_bkransomware.exe
Token: SeDebugPrivilege	1680	CTS.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3728 wrote to memory of 4036	3728	2024-04-28_f826928418350daed0959b6fe5837208_bkransomware.exe	82
PID 3728 wrote to memory of 4036	3728	2024-04-28_f826928418350daed0959b6fe5837208_bkransomware.exe	82
PID 3728 wrote to memory of 4036	3728	2024-04-28_f826928418350daed0959b6fe5837208_bkransomware.exe	82
PID 3728 wrote to memory of 1680	3728	2024-04-28_f826928418350daed0959b6fe5837208_bkransomware.exe	83
PID 3728 wrote to memory of 1680	3728	2024-04-28_f826928418350daed0959b6fe5837208_bkransomware.exe	83
PID 3728 wrote to memory of 1680	3728	2024-04-28_f826928418350daed0959b6fe5837208_bkransomware.exe	83

C:\Users\Admin\AppData\Local\Temp\2024-04-28_f826928418350daed0959b6fe5837208_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-28_f826928418350daed0959b6fe5837208_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3728
- C:\Users\Admin\AppData\Local\Temp\QwtoUzWytMxpn9D.exe
  C:\Users\Admin\AppData\Local\Temp\QwtoUzWytMxpn9D.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  PID:4036
- 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:1680

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

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
392KB

MD5
7692fa9faab1bb1b2920ebca2bb33458

SHA1
422e1f9fc950b659bb5fd3c2e00614393b0fb953

SHA256
b0bb2c3e1d61f1695e29f644df0aeae1251196748af7295f45c6933a43b62d35

SHA512
4fa4fa6453883e9f8659f43c5d62e19fd08aad7964c6a7578d526ca6940471104473a721fcadebb1c81309c983dac8cd806ed80ad1dd5f8781f6414fb3e02d13

Download Submit
C:\Users\Admin\AppData\Local\Temp\QwtoUzWytMxpn9D.exe

Filesize
11.7MB

MD5
d50d5712566f1df16b5aea21b9e0ee24

SHA1
f442aa68ec8d838625f382bcf273f5d0f66427ea

SHA256
e102238100a8b97d22559065e3b19379757aeda932c36916d2c84a4178921854

SHA512
f9b8d6762a8b00392519b949083d5f0a3670ed24583ed4aaa7570cbc24914e0c19933486004d8949fbee930b8f0e66b50a05e3c478c193ba269677dcd619d7d0

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsj372F.tmp\InstallOptions.dll

Filesize
14KB

MD5
d753362649aecd60ff434adf171a4e7f

SHA1
3b752ad064e06e21822c8958ae22e9a6bb8cf3d0

SHA256
8f24c6cf0b06d18f3c07e7bfca4e92afce71834663746cfaa9ddf52a25d5c586

SHA512
41bf41add275867553fa3bd8835cd7e2a2a362a2d5670ccbfad23700448bad9fe0f577fb6ee9d4eb81dfc10d463b325b8a873fe5912eb580936d4ad96587aa6d

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsj372F.tmp\System.dll

Filesize
10KB

MD5
56a321bd011112ec5d8a32b2f6fd3231

SHA1
df20e3a35a1636de64df5290ae5e4e7572447f78

SHA256
bb6df93369b498eaa638b0bcdc4bb89f45e9b02ca12d28bcedf4629ea7f5e0f1

SHA512
5354890cbc53ce51081a78c64ba9c4c8c4dc9e01141798c1e916e19c5776dac7c82989fad0f08c73e81aaba332dad81205f90d0663119af45550b97b338b9cc3

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsj372F.tmp\UserInfo.dll

Filesize
4KB

MD5
e840e7f30c85e22b09a41098ff3f3343

SHA1
ad1eb7b2ba66ae87641947025736c67efbc4b9d8

SHA256
6707e9e88dec460c2cf421bd2bc6a314f15717527cb60dcad2fbb7352ae711a3

SHA512
ea1362c9e7ac9666d6cbfc02939a6e9c411f6aef113dc8ec898c383fc4ecf9d957c6ad8f75c33847d5da0b4427c861f0ccaf240cb1def189313de2948881dc1b

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsj372F.tmp\ioSpecial.ini

Filesize
700B

MD5
11603a8035f8c27d2212c2b623c70f0c

SHA1
5759df636686ae4670b50d01d77d66364780f467

SHA256
e80e720d635f629e05bb045a73ca709e095ace977565ac3885f2e88bc99b4532

SHA512
e5102ee988fda9788fec9b2a6fcad122b1d80347e98f3b13886229d502e6280aa9cd035ac3a7a2ebdb5c551e64fbc77dedca59cc7f1777a61c4a9bd06dde440d

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