isrstealer | e5bb390d7ddab6f9e2643c7cb08102403ee8df2cc1324c695d057215ad5c27b1

General

Target

b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
Size

328KB
MD5

b6395793ba19c6fa00f3bf3000e14a0c
SHA1

74c3a3f6ada501e7f3f1938c8b0dca65a06d1f66
SHA256

e5bb390d7ddab6f9e2643c7cb08102403ee8df2cc1324c695d057215ad5c27b1
SHA512

58bf64106262adef851db7d86eb1a5ebd22bf5f994e79668a9cead5a4147a8d3e3c5e62bba12c432b144c311ccb8014d16bb94676006fc4b6468e34af5e11930
SSDEEP

3072:VsuFj9G9qW6DtkDNrvrUF3UzmVURsZefVSP0C2rlgKTWUXT/4w6RXFXjHe6gOLfJ:VvA8kxw+wUIeG2EUDwPdH9gm0mbH

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 4 IoCs

resource	yara_rule
behavioral2/memory/4408-7-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/4408-9-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/4408-14-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/4408-17-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer

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

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	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1196 set thread context of 4968	1196	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	92
PID 4968 set thread context of 4408	4968	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	93

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 3 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	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4408	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
4408	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
4408	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
4408	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
4408	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
4408	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
4408	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
4408	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1196	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
4968	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
4408	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 1196 wrote to memory of 4968	1196	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	92
PID 1196 wrote to memory of 4968	1196	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	92
PID 1196 wrote to memory of 4968	1196	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	92
PID 1196 wrote to memory of 4968	1196	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	92
PID 1196 wrote to memory of 4968	1196	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	92
PID 1196 wrote to memory of 4968	1196	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	92
PID 1196 wrote to memory of 4968	1196	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	92
PID 1196 wrote to memory of 4968	1196	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	92
PID 4968 wrote to memory of 4408	4968	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	93
PID 4968 wrote to memory of 4408	4968	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	93
PID 4968 wrote to memory of 4408	4968	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	93
PID 4968 wrote to memory of 4408	4968	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	93
PID 4968 wrote to memory of 4408	4968	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	93
PID 4968 wrote to memory of 4408	4968	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	93
PID 4968 wrote to memory of 4408	4968	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	93
PID 4968 wrote to memory of 4408	4968	b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe	93

C:\Users\Admin\AppData\Local\Temp\b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1196
- C:\Users\Admin\AppData\Local\Temp\b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe"
  2⤵
  - 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:4968
- - C:\Users\Admin\AppData\Local\Temp\b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe
    "C:\Users\Admin\AppData\Local\Temp\b6395793ba19c6fa00f3bf3000e14a0c_JaffaCakes118.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:4408

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Unsecured Credentials

2

T1552

Credentials In Files

2

T1552.001

Discovery

System Information Discovery

1

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

memory/4408-7-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4408-9-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4408-14-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4408-17-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4968-2-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4968-4-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4968-12-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads