isrstealer | a52ac716cc69375814d98ffba09cbeb6b50a322bc9499196b16fda2ac84b819a

Analysis

max time kernel
145s
max time network
123s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
30-09-2024 18:35

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General

Target

XVCU Keygen/keygen.exe
Size

424KB
MD5

8bdf1e56943249066a5300ddd31d3b3b
SHA1

89c07ee977b21595039ad7a7ee94dfb41868a23f
SHA256

5a6c4407831f1e2dfcefeec9d8062087a3335387757c07da0f8bcbc838929182
SHA512

a180592c084b107f81f807eeed908575faae718ad57129800d0e683f98a09f701f7982dde2e8766bc6500b407005d8a340d03e3aab04351f9e0633b11c534cc2
SSDEEP

12288:17J7YiFAI1E/vzM9NsNBB+j+qTangZ3M7h9tcnd7OnTppl:1OiFA4EfBB+tYgZ3M7h9todKTL

Score

10^/10

isrstealer bootkit discovery persistence spyware stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 3 IoCs

resource	yara_rule
behavioral2/memory/3312-36-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/3312-34-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/3312-43-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\International\Geo\Nation	keygen.exe

Executes dropped EXE 4 IoCs

pid	Process
2156	keygen.exe
548	3AMD6.exe
736	3AMD6.exe
3312	3AMD6.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

Writes to the Master Boot Record (MBR) 1 TTPs 2 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	3AMD6.exe
File opened for modification	\??\PhysicalDrive0	keygen.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1572 set thread context of 4944	1572	keygen.exe	82
PID 548 set thread context of 736	548	3AMD6.exe	91
PID 736 set thread context of 3312	736	3AMD6.exe	92

UPX packed file 17 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/files/0x0008000000023432-11.dat	upx
behavioral2/memory/2156-14-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-41-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-42-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-45-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-46-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-47-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-48-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-49-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-50-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-51-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-52-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-53-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-54-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-55-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-56-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/2156-57-0x0000000000400000-0x000000000043B000-memory.dmp	upx

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3AMD6.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3AMD6.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	keygen.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	keygen.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	keygen.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3AMD6.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
3312	3AMD6.exe
3312	3AMD6.exe
3312	3AMD6.exe
3312	3AMD6.exe
3312	3AMD6.exe
3312	3AMD6.exe
3312	3AMD6.exe
3312	3AMD6.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: 33	4512	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	4512	AUDIODG.EXE

Suspicious use of SetWindowsHookEx 5 IoCs

pid	Process
1572	keygen.exe
4944	keygen.exe
548	3AMD6.exe
736	3AMD6.exe
3312	3AMD6.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1572 wrote to memory of 4944	1572	keygen.exe	82
PID 1572 wrote to memory of 4944	1572	keygen.exe	82
PID 1572 wrote to memory of 4944	1572	keygen.exe	82
PID 1572 wrote to memory of 4944	1572	keygen.exe	82
PID 1572 wrote to memory of 4944	1572	keygen.exe	82
PID 1572 wrote to memory of 4944	1572	keygen.exe	82
PID 1572 wrote to memory of 4944	1572	keygen.exe	82
PID 1572 wrote to memory of 4944	1572	keygen.exe	82
PID 4944 wrote to memory of 2156	4944	keygen.exe	83
PID 4944 wrote to memory of 2156	4944	keygen.exe	83
PID 4944 wrote to memory of 2156	4944	keygen.exe	83
PID 4944 wrote to memory of 548	4944	keygen.exe	84
PID 4944 wrote to memory of 548	4944	keygen.exe	84
PID 4944 wrote to memory of 548	4944	keygen.exe	84
PID 548 wrote to memory of 736	548	3AMD6.exe	91
PID 548 wrote to memory of 736	548	3AMD6.exe	91
PID 548 wrote to memory of 736	548	3AMD6.exe	91
PID 548 wrote to memory of 736	548	3AMD6.exe	91
PID 548 wrote to memory of 736	548	3AMD6.exe	91
PID 548 wrote to memory of 736	548	3AMD6.exe	91
PID 548 wrote to memory of 736	548	3AMD6.exe	91
PID 548 wrote to memory of 736	548	3AMD6.exe	91
PID 736 wrote to memory of 3312	736	3AMD6.exe	92
PID 736 wrote to memory of 3312	736	3AMD6.exe	92
PID 736 wrote to memory of 3312	736	3AMD6.exe	92
PID 736 wrote to memory of 3312	736	3AMD6.exe	92
PID 736 wrote to memory of 3312	736	3AMD6.exe	92
PID 736 wrote to memory of 3312	736	3AMD6.exe	92
PID 736 wrote to memory of 3312	736	3AMD6.exe	92
PID 736 wrote to memory of 3312	736	3AMD6.exe	92

C:\Users\Admin\AppData\Local\Temp\XVCU Keygen\keygen.exe
"C:\Users\Admin\AppData\Local\Temp\XVCU Keygen\keygen.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1572
- C:\Users\Admin\AppData\Local\Temp\XVCU Keygen\keygen.exe
  "C:\Users\Admin\AppData\Local\Temp\XVCU Keygen\keygen.exe"
  2⤵
  - Checks computer location settings
  - Writes to the Master Boot Record (MBR)
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4944
- - C:\Users\Admin\AppData\Local\Temp\keygen.exe
    "C:\Users\Admin\AppData\Local\Temp\keygen.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2156
- - C:\Users\Admin\AppData\Local\Temp\3AMD6.exe
    "C:\Users\Admin\AppData\Local\Temp\3AMD6.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:548
  - - C:\Users\Admin\AppData\Local\Temp\3AMD6.exe
      "C:\Users\Admin\AppData\Local\Temp\3AMD6.exe"
      4⤵
      Executes dropped EXE
      Writes to the Master Boot Record (MBR)
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:736
    - - C:\Users\Admin\AppData\Local\Temp\3AMD6.exe
        
        "C:\Users\Admin\AppData\Local\Temp\3AMD6.exe"
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of SetWindowsHookEx
        
        PID:3312

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x338 0x3d0
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4512

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\3AMD6.exe

Filesize
216KB

MD5
e8377d68dd4cb32a5b2f297f0fa57af2

SHA1
de014168a57c2944f017864a577b7907bd39ccdd

SHA256
1a2dc99f5754dfd8a60adf310c66bbe114c078b6180d70d57b323bbfdb8b15d6

SHA512
7418da13668097b72c85d26dbd7e6d2d0d416213860edd72861aae414309e50781743f192a95bed849cdedc4bc1c6e6de523f6900c1fa7bb375b6ee264044ace

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

Filesize
65KB

MD5
d17297a133be2aa4c37c97242b742536

SHA1
78b3a99b144ec31c9426fbfa9d94d23b62c4e8ca

SHA256
5eeeefeaf03936c65c82d71a0521098b5dd96fc644f501c176a18fb7efbeb234

SHA512
3228e6e5bd42d6fd70f430c241622aebb2e40050b8c8b081ba310ec68708daefd6dd2ea82f8132f7c34866e87e8461d661dfbb126b521401aa8638808a842dc4

Download Submit
memory/736-29-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/736-37-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/736-31-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2156-42-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-47-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-14-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-57-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-56-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-55-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-41-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-54-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-53-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-45-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-46-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-52-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-48-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-49-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-50-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/2156-51-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/3312-43-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/3312-34-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/3312-36-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4944-28-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4944-2-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4944-4-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download