isrstealer | 08dc6c6bc916f05577694a26c660b9a500e6d72c8c9a863f52440d17b798c2ca

Analysis

max time kernel
77s
max time network
134s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
02/10/2024, 22:30

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General

Target

0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe
Size

672KB
MD5

0cb651bf414b2fc0cef464870ab1e850
SHA1

fc86f69e2554f69b387ceb629decc998720dae85
SHA256

08dc6c6bc916f05577694a26c660b9a500e6d72c8c9a863f52440d17b798c2ca
SHA512

e49d2fc3fe3fe297e18cfea5f66376f0ee116b6fadbf8fa1ecc58248877cbdf2047d636d55940a5bbcb691032aa508bad7e42054d00a4c251dc86f753b5db00c
SSDEEP

12288:cO3CUmFTPWO2YP1SifXtUsn1Fv2RaDlVkvb:73rmAlYNXvtUsORaDIv

Score

10^/10

isrstealer bootkit discovery evasion persistence privilege_escalation spyware stealer trojan

Malware Config

Signatures

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

ISR Stealer payload 1 IoCs

resource	yara_rule
behavioral2/files/0x0008000000023464-12.dat	family_isrstealer

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\system32\\userinit.exe,C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\csrss.exe"	5r5hO2.exe

Adds policy Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	5r5hO2.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\csrss = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\csrss.exe"	5r5hO2.exe
Key created	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	5r5hO2.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\csrss = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\csrss.exe"	5r5hO2.exe

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
3568	netsh.exe

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-1-5-21-2392887640-1187051047-2909758433-1000\Control Panel\International\Geo\Nation	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe

Executes dropped EXE 7 IoCs

pid	Process
2164	reguldownloaddata.exe
4836	5r5hO2.exe
2280	5r5hO2.exe
4312	5r5hO2.exe
4380	csrss.exe
4760	csrss.exe
5000	csrss.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

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\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\csrss.exe"	5r5hO2.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\csrss = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\csrss.exe"	5r5hO2.exe

Writes to the Master Boot Record (MBR) 1 TTPs 3 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	5r5hO2.exe
File opened for modification	\??\PhysicalDrive0	csrss.exe
File opened for modification	\??\PhysicalDrive0	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 2900 set thread context of 1232	2900	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	84
PID 4836 set thread context of 2280	4836	5r5hO2.exe	87
PID 2280 set thread context of 4312	2280	5r5hO2.exe	88
PID 4380 set thread context of 4760	4380	csrss.exe	96
PID 4760 set thread context of 5000	4760	csrss.exe	97

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

System Information Discovery
T1082

Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

description	ioc	Process
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

System Location Discovery: System Language Discovery 1 TTPs 10 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	csrss.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5r5hO2.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5r5hO2.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csrss.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csrss.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reguldownloaddata.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5r5hO2.exe

System Time Discovery 1 TTPs 1 IoCs

Adversary may gather the system time and/or time zone settings from a local or remote system.

discovery

System Time Discovery

T1124

pid	Process
3568	netsh.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2164	reguldownloaddata.exe
2164	reguldownloaddata.exe
2164	reguldownloaddata.exe
2164	reguldownloaddata.exe
2164	reguldownloaddata.exe
2164	reguldownloaddata.exe
2164	reguldownloaddata.exe
2164	reguldownloaddata.exe

Suspicious use of SetWindowsHookEx 9 IoCs

pid	Process
2900	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe
1232	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe
2164	reguldownloaddata.exe
4836	5r5hO2.exe
2280	5r5hO2.exe
4312	5r5hO2.exe
4380	csrss.exe
4760	csrss.exe
5000	csrss.exe

Suspicious use of WriteProcessMemory 52 IoCs

description	pid	Process	procid_target
PID 2900 wrote to memory of 1232	2900	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	84
PID 2900 wrote to memory of 1232	2900	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	84
PID 2900 wrote to memory of 1232	2900	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	84
PID 2900 wrote to memory of 1232	2900	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	84
PID 2900 wrote to memory of 1232	2900	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	84
PID 2900 wrote to memory of 1232	2900	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	84
PID 2900 wrote to memory of 1232	2900	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	84
PID 2900 wrote to memory of 1232	2900	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	84
PID 1232 wrote to memory of 2164	1232	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	85
PID 1232 wrote to memory of 2164	1232	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	85
PID 1232 wrote to memory of 2164	1232	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	85
PID 1232 wrote to memory of 4836	1232	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	86
PID 1232 wrote to memory of 4836	1232	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	86
PID 1232 wrote to memory of 4836	1232	0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe	86
PID 4836 wrote to memory of 2280	4836	5r5hO2.exe	87
PID 4836 wrote to memory of 2280	4836	5r5hO2.exe	87
PID 4836 wrote to memory of 2280	4836	5r5hO2.exe	87
PID 4836 wrote to memory of 2280	4836	5r5hO2.exe	87
PID 4836 wrote to memory of 2280	4836	5r5hO2.exe	87
PID 4836 wrote to memory of 2280	4836	5r5hO2.exe	87
PID 4836 wrote to memory of 2280	4836	5r5hO2.exe	87
PID 4836 wrote to memory of 2280	4836	5r5hO2.exe	87
PID 2280 wrote to memory of 4312	2280	5r5hO2.exe	88
PID 2280 wrote to memory of 4312	2280	5r5hO2.exe	88
PID 2280 wrote to memory of 4312	2280	5r5hO2.exe	88
PID 2280 wrote to memory of 4312	2280	5r5hO2.exe	88
PID 2280 wrote to memory of 4312	2280	5r5hO2.exe	88
PID 2280 wrote to memory of 4312	2280	5r5hO2.exe	88
PID 2280 wrote to memory of 4312	2280	5r5hO2.exe	88
PID 2280 wrote to memory of 4312	2280	5r5hO2.exe	88
PID 4312 wrote to memory of 3568	4312	5r5hO2.exe	89
PID 4312 wrote to memory of 3568	4312	5r5hO2.exe	89
PID 4312 wrote to memory of 3568	4312	5r5hO2.exe	89
PID 4312 wrote to memory of 4380	4312	5r5hO2.exe	91
PID 4312 wrote to memory of 4380	4312	5r5hO2.exe	91
PID 4312 wrote to memory of 4380	4312	5r5hO2.exe	91
PID 4380 wrote to memory of 4760	4380	csrss.exe	96
PID 4380 wrote to memory of 4760	4380	csrss.exe	96
PID 4380 wrote to memory of 4760	4380	csrss.exe	96
PID 4380 wrote to memory of 4760	4380	csrss.exe	96
PID 4380 wrote to memory of 4760	4380	csrss.exe	96
PID 4380 wrote to memory of 4760	4380	csrss.exe	96
PID 4380 wrote to memory of 4760	4380	csrss.exe	96
PID 4380 wrote to memory of 4760	4380	csrss.exe	96
PID 4760 wrote to memory of 5000	4760	csrss.exe	97
PID 4760 wrote to memory of 5000	4760	csrss.exe	97
PID 4760 wrote to memory of 5000	4760	csrss.exe	97
PID 4760 wrote to memory of 5000	4760	csrss.exe	97
PID 4760 wrote to memory of 5000	4760	csrss.exe	97
PID 4760 wrote to memory of 5000	4760	csrss.exe	97
PID 4760 wrote to memory of 5000	4760	csrss.exe	97
PID 4760 wrote to memory of 5000	4760	csrss.exe	97

C:\Users\Admin\AppData\Local\Temp\0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2900
- C:\Users\Admin\AppData\Local\Temp\0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\0cb651bf414b2fc0cef464870ab1e850_JaffaCakes118.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:1232
- - C:\Users\Admin\AppData\Local\Temp\reguldownloaddata.exe
    "C:\Users\Admin\AppData\Local\Temp\reguldownloaddata.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:2164
- - C:\Users\Admin\AppData\Local\Temp\5r5hO2.exe
    "C:\Users\Admin\AppData\Local\Temp\5r5hO2.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4836
  - - C:\Users\Admin\AppData\Local\Temp\5r5hO2.exe
      "C:\Users\Admin\AppData\Local\Temp\5r5hO2.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:2280
    - - C:\Users\Admin\AppData\Local\Temp\5r5hO2.exe
        
        "C:\Users\Admin\AppData\Local\Temp\5r5hO2.exe"
        5⤵
        Modifies WinLogon for persistence
        Adds policy Run key to start application
        Executes dropped EXE
        Adds Run key to start application
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:4312
      - C:\Windows\SysWOW64\netsh.exe
        
        netsh advfirewall firewall add rule name="Nero" dir=in action=allow description="Multimedia suite" program="C:\Users\Admin\AppData\Roaming\Microsoft\csrss.exe" enable=yes
        6⤵
        Modifies Windows Firewall
        Event Triggered Execution: Netsh Helper DLL
        System Location Discovery: System Language Discovery
        System Time Discovery
        
        PID:3568
      - C:\Users\Admin\AppData\Roaming\Microsoft\csrss.exe
        
        C:\Users\Admin\AppData\Local\Temp\5r5hO2.exe
        6⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:4380
        
        C:\Users\Admin\AppData\Roaming\Microsoft\csrss.exe
        
        C:\Users\Admin\AppData\Local\Temp\5r5hO2.exe
        7⤵
        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:4760
        
        C:\Users\Admin\AppData\Roaming\Microsoft\csrss.exe
        
        C:\Users\Admin\AppData\Local\Temp\5r5hO2.exe
        8⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:5000

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

Winlogon Helper DLL

T1547.004

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Modify Registry

T1112

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

System Time Discovery

T1124

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\5r5hO2.exe

Filesize
364KB

MD5
950bf772d9bccfc9bc67080f39d2f02d

SHA1
48a8654408ebc715222fff31dccdb8d322d458fc

SHA256
bedb145f62b54a2068c05336d139a114f2668fabcbd3af67546203ede60d55cd

SHA512
d9e6ce9b2320dda780e5a2ad9c75532d17bf4e41289611b9cb92ca979bba1ae41a7fd77564e2a38b499211706f9ddb350d342a5c7b5cce44b3093d36d58c694b

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

Filesize
76KB

MD5
8d86e2bfaa3a58d5315e529db2110fb6

SHA1
76e7fd12b199fda99463fca4bd74c98bc4f9514c

SHA256
6b6154c34df4a4036146e014e3f5d7dd92da68ba321b729035a45780559f534e

SHA512
fb31f227c68cf0dace1e6952992707d4e69138fe0f59254f513ee14ddb8cd656b76d388d53cd551fc63af62157991da0221f6e903a3c59a883d07ad5a2278512

Download Submit
memory/1232-2-0x0000000000400000-0x000000000047A000-memory.dmp

Filesize
488KB

Download
memory/1232-4-0x0000000000400000-0x000000000047A000-memory.dmp

Filesize
488KB

Download
memory/1232-32-0x0000000000400000-0x000000000047A000-memory.dmp

Filesize
488KB

Download
memory/2280-38-0x0000000000400000-0x000000000042D000-memory.dmp

Filesize
180KB

Download
memory/2280-35-0x0000000000400000-0x000000000042D000-memory.dmp

Filesize
180KB

Download
memory/2280-45-0x0000000000400000-0x000000000042D000-memory.dmp

Filesize
180KB

Download
memory/4312-41-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/4312-43-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/4312-53-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/4760-66-0x0000000000400000-0x000000000042D000-memory.dmp

Filesize
180KB

Download
memory/5000-81-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download