isrstealer | 95f5e8a8f81cc22aa687cf82e0d6cadbf130f25018fa0097710927ed40d2f939

General

Target

b42e7395d548094719753ce21cafc064_JaffaCakes118.exe
Size

500KB
MD5

b42e7395d548094719753ce21cafc064
SHA1

6baed6fc826f81aa77cbd71945c46d44c04718e4
SHA256

95f5e8a8f81cc22aa687cf82e0d6cadbf130f25018fa0097710927ed40d2f939
SHA512

52d741889f330dddfa97897c3b642fbd7a05364b1122e794a4deab0d4c2214f6629b2e03727f5422161fff4d83e82b93866339623917b88e8123fc271a6a4557
SSDEEP

12288:G3s06nf8okk8kGfCIcgiLTXWswMGMv0MSPmIQWe:BPfkkZ8diLjXzGySPm7We

Score

10^/10

isrstealer bootkit discovery persistence 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/0x0003000000022ab4-11.dat	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-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe

Executes dropped EXE 2 IoCs

pid	Process
540	mw_111221_passwd.exe
1220	mw_111221_vnpanel.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 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 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-523280732-2327480845-3730041215-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\crssr = "C:\\Users\\Admin\\AppData\\Roaming\\crssr"	mw_111221_vnpanel.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 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	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3720 set thread context of 4964	3720	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	91

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 4 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	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mw_111221_passwd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mw_111221_vnpanel.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
540	mw_111221_passwd.exe
540	mw_111221_passwd.exe
540	mw_111221_passwd.exe
540	mw_111221_passwd.exe
540	mw_111221_passwd.exe
540	mw_111221_passwd.exe
540	mw_111221_passwd.exe
540	mw_111221_passwd.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
3720	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe
4964	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe
540	mw_111221_passwd.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3720 wrote to memory of 4964	3720	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	91
PID 3720 wrote to memory of 4964	3720	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	91
PID 3720 wrote to memory of 4964	3720	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	91
PID 3720 wrote to memory of 4964	3720	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	91
PID 3720 wrote to memory of 4964	3720	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	91
PID 3720 wrote to memory of 4964	3720	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	91
PID 3720 wrote to memory of 4964	3720	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	91
PID 3720 wrote to memory of 4964	3720	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	91
PID 4964 wrote to memory of 540	4964	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	92
PID 4964 wrote to memory of 540	4964	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	92
PID 4964 wrote to memory of 540	4964	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	92
PID 4964 wrote to memory of 1220	4964	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	93
PID 4964 wrote to memory of 1220	4964	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	93
PID 4964 wrote to memory of 1220	4964	b42e7395d548094719753ce21cafc064_JaffaCakes118.exe	93

C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3720
- C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\b42e7395d548094719753ce21cafc064_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:4964
- - C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe
    "C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:540
- - C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe
    "C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    PID:1220

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

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Unsecured Credentials

2

T1552

Credentials In Files

2

T1552.001

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\mw_111221_passwd.exe

Filesize
76KB

MD5
32c96c4a94e4066cc6eeb2b0d24dfc36

SHA1
d256f6ea46af1c578d96b59d945f00880f9aa4f0

SHA256
02d227751808eb5cd476c91d6b2f8260c812042de78fc04ae3770168f2873f97

SHA512
af0e6c6b8ba9769b5981780740b00bac46c3cc1ae552e5d6a6a29f6eeb4df312e3f39cbd163e5d612125ae2f91173432b6a22aa1dcccc7c5eff9aafad0692fe2

Download Submit
C:\Users\Admin\AppData\Local\Temp\mw_111221_vnpanel.exe

Filesize
166KB

MD5
16cde6a521edcd5cc7fa9860096f9222

SHA1
b69246e52d0adee6725fd9ec69c7a7b9974b7634

SHA256
cdd686b7f74b3f0224bbc44daffe7fa9cc9309838866f1586d317a7df5e5df6f

SHA512
41ebfe0a023213113e13307d9bcea0f780f9604cdaa444ce73cc720156d2f3868f1f32c585ad2eb8a8bdd60a0d0ba14e1140d1fd484b4cd75de8ff02826869b9

Download Submit
memory/4964-2-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download
memory/4964-4-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download
memory/4964-28-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads