077c066e066e532bb7160acc84c29bc94d0a6358e6cbfee14a96072b10101aa7

General

Target

2024-05-31_700a503adb5a31e70d8a1e453d8c947d_bkransomware.exe
Size

11.8MB
MD5

700a503adb5a31e70d8a1e453d8c947d
SHA1

112034f248f9ff475840871d82bf2aa59709a89b
SHA256

077c066e066e532bb7160acc84c29bc94d0a6358e6cbfee14a96072b10101aa7
SHA512

3cb7b403884da6bd215d974e78abbd7916dbf16e55214fe862750d4179334dac775027735933e8bbd18e25ac357c2cfe6adccde84418d0bb2ee3d56f30512477
SSDEEP

196608:2q9iCarDM5O64kIoKVq35HZM0SUWDtt25rrlnB9gYH3fS3Y9z4X7VGdkeiNxkyZE:99k0zxIP4bMmWp4BrlB9zH3fS30woeeT

Score

7^/10

Malware Config

Signatures

Executes dropped EXE 2 IoCs

pid	Process
3356	lW8SIRJ7RuLCsgb.exe
2884	CTS.exe

Loads dropped DLL 5 IoCs

pid	Process
3356	lW8SIRJ7RuLCsgb.exe
3356	lW8SIRJ7RuLCsgb.exe
3356	lW8SIRJ7RuLCsgb.exe
3356	lW8SIRJ7RuLCsgb.exe
3356	lW8SIRJ7RuLCsgb.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"	2024-05-31_700a503adb5a31e70d8a1e453d8c947d_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	2024-05-31_700a503adb5a31e70d8a1e453d8c947d_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/0x0006000000023278-3.dat	nsis_installer_1
behavioral2/files/0x0006000000023278-3.dat	nsis_installer_2

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4836	2024-05-31_700a503adb5a31e70d8a1e453d8c947d_bkransomware.exe
Token: SeDebugPrivilege	2884	CTS.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 3356	4836	2024-05-31_700a503adb5a31e70d8a1e453d8c947d_bkransomware.exe	83
PID 4836 wrote to memory of 3356	4836	2024-05-31_700a503adb5a31e70d8a1e453d8c947d_bkransomware.exe	83
PID 4836 wrote to memory of 3356	4836	2024-05-31_700a503adb5a31e70d8a1e453d8c947d_bkransomware.exe	83
PID 4836 wrote to memory of 2884	4836	2024-05-31_700a503adb5a31e70d8a1e453d8c947d_bkransomware.exe	84
PID 4836 wrote to memory of 2884	4836	2024-05-31_700a503adb5a31e70d8a1e453d8c947d_bkransomware.exe	84
PID 4836 wrote to memory of 2884	4836	2024-05-31_700a503adb5a31e70d8a1e453d8c947d_bkransomware.exe	84

C:\Users\Admin\AppData\Local\Temp\2024-05-31_700a503adb5a31e70d8a1e453d8c947d_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-31_700a503adb5a31e70d8a1e453d8c947d_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4836
- C:\Users\Admin\AppData\Local\Temp\lW8SIRJ7RuLCsgb.exe
  C:\Users\Admin\AppData\Local\Temp\lW8SIRJ7RuLCsgb.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  PID:3356
- 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:2884

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
a96fbc3ed17f4857ca992f4406ffe11c

SHA1
cd9aedcd19cee4a46d03a6a9f71e07131758722a

SHA256
f5e4fc26e2864424463a0f663114a975bd23d7f5571eb2a9be0c68c9f7171311

SHA512
39de7684d2b02c7c1445ad4a2e1fe59ecba5390d745e326203e7bd166252cfc7302784c3e42489edde9d04e79f3eeff622d51f45d0031632521487b54841b8d2

Download Submit
C:\Users\Admin\AppData\Local\Temp\lW8SIRJ7RuLCsgb.exe

Filesize
11.7MB

MD5
d50d5712566f1df16b5aea21b9e0ee24

SHA1
f442aa68ec8d838625f382bcf273f5d0f66427ea

SHA256
e102238100a8b97d22559065e3b19379757aeda932c36916d2c84a4178921854

SHA512
f9b8d6762a8b00392519b949083d5f0a3670ed24583ed4aaa7570cbc24914e0c19933486004d8949fbee930b8f0e66b50a05e3c478c193ba269677dcd619d7d0

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsw5824.tmp\InstallOptions.dll

Filesize
14KB

MD5
d753362649aecd60ff434adf171a4e7f

SHA1
3b752ad064e06e21822c8958ae22e9a6bb8cf3d0

SHA256
8f24c6cf0b06d18f3c07e7bfca4e92afce71834663746cfaa9ddf52a25d5c586

SHA512
41bf41add275867553fa3bd8835cd7e2a2a362a2d5670ccbfad23700448bad9fe0f577fb6ee9d4eb81dfc10d463b325b8a873fe5912eb580936d4ad96587aa6d

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsw5824.tmp\System.dll

Filesize
10KB

MD5
56a321bd011112ec5d8a32b2f6fd3231

SHA1
df20e3a35a1636de64df5290ae5e4e7572447f78

SHA256
bb6df93369b498eaa638b0bcdc4bb89f45e9b02ca12d28bcedf4629ea7f5e0f1

SHA512
5354890cbc53ce51081a78c64ba9c4c8c4dc9e01141798c1e916e19c5776dac7c82989fad0f08c73e81aaba332dad81205f90d0663119af45550b97b338b9cc3

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsw5824.tmp\UserInfo.dll

Filesize
4KB

MD5
e840e7f30c85e22b09a41098ff3f3343

SHA1
ad1eb7b2ba66ae87641947025736c67efbc4b9d8

SHA256
6707e9e88dec460c2cf421bd2bc6a314f15717527cb60dcad2fbb7352ae711a3

SHA512
ea1362c9e7ac9666d6cbfc02939a6e9c411f6aef113dc8ec898c383fc4ecf9d957c6ad8f75c33847d5da0b4427c861f0ccaf240cb1def189313de2948881dc1b

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsw5824.tmp\ioSpecial.ini

Filesize
700B

MD5
d131fd9f3b56cdb2b86a3ab429008845

SHA1
dfe91329a9c3bb815c36d8899c617eb90dd8cc31

SHA256
01e4c34c493879ee87b818cfee781a67aa6d234c3f950d3694f08fe4d49ab551

SHA512
dfb132b91121ffae43c10c240a87aa7ba1bc12306934ed99295a41025ac9db7833af13f8610ad04ac7b00d4d1b8f12154e8e69b4f61a02e0c9c90ff5550cb0cd

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