237cd66950f0ea22643de353894a495688ba574355a8156f9fc5ed3a26e5e6c1

Analysis

max time kernel
93s
max time network
95s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
03/05/2024, 10:28

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General

Target

2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe
Size

135KB
MD5

905f2311a180ec3bce2aa7e517c2c671
SHA1

48d8ea911d0fc45143df8efc2b0c17e72bab3d17
SHA256

237cd66950f0ea22643de353894a495688ba574355a8156f9fc5ed3a26e5e6c1
SHA512

2cfe78d9af5e31117077c586d398f2fe01d1c69a30adcc5d62c052dcff6599c8f8dae3b226a146f6f175a276ffd4d29ef640daecbc5cad79f41749ab375ea7b2
SSDEEP

3072:ZhpAyazIlyazTL5L/2eKFhhH47GCzp0uqUOPF:hZMaz1TePnCzKJPF

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 2 IoCs

pid	Process
5004	Fi2K9GlprHERtLm.exe
856	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"	2024-05-03_905f2311a180ec3bce2aa7e517c2c671_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	2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4388	2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe
Token: SeDebugPrivilege	856	CTS.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4388 wrote to memory of 5004	4388	2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe	81
PID 4388 wrote to memory of 5004	4388	2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe	81
PID 4388 wrote to memory of 5004	4388	2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe	81
PID 4388 wrote to memory of 856	4388	2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe	82
PID 4388 wrote to memory of 856	4388	2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe	82
PID 4388 wrote to memory of 856	4388	2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe	82

C:\Users\Admin\AppData\Local\Temp\2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4388
- C:\Users\Admin\AppData\Local\Temp\Fi2K9GlprHERtLm.exe
  C:\Users\Admin\AppData\Local\Temp\Fi2K9GlprHERtLm.exe
  2⤵
  - Executes dropped EXE
  PID:5004
- 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:856

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
392KB

MD5
696c735b822b2caec4e9e4b4389a64ba

SHA1
b03c443cca9d14320ece255c71751ac5c61d83e0

SHA256
a5f94b9443f76983914c843da5ecd3377f79ed75e4410d17f04d36d9b4229878

SHA512
d81439814db951b444fffc7e23e84f1ae0a76b5e3f19b6ead4c15909e7f74f90043720d6d1d6718415766468db4532e0a6d74bcd9503480dfd82bba2d0815296

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C:\Users\Admin\AppData\Local\Temp\Fi2K9GlprHERtLm.exe

Filesize
64KB

MD5
a32a382b8a5a906e03a83b4f3e5b7a9b

SHA1
11e2bdd0798761f93cce363329996af6c17ed796

SHA256
75f12ea2f30d9c0d872dade345f30f562e6d93847b6a509ba53beec6d0b2c346

SHA512
ec87dd957be21b135212454646dcabdd7ef9442cf714e2c1f6b42b81f0c3fa3b1875bde9a8b538e8a0aa2190225649c29e9ed0f25176e7659e55e422dd4efe4c

Download Submit
C:\Windows\CTS.exe

Filesize
71KB

MD5
66df4ffab62e674af2e75b163563fc0b

SHA1
dec8a197312e41eeb3cfef01cb2a443f0205cd6e

SHA256
075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

SHA512
1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads