isrstealer | a667935edc15dba0349d3035a428dbc6f13a3282cbf079757635e57698726db3

Analysis

max time kernel
130s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
30-08-2024 17:33

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General

Target

cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
Size

120KB
MD5

cb51b706cbcb7d64cf679468e099b9af
SHA1

98fbe71667b137bdb191fc5b5bf51487297283f6
SHA256

a667935edc15dba0349d3035a428dbc6f13a3282cbf079757635e57698726db3
SHA512

b3be9d357a91e3c3902c86402399cfe0c824a0ddb6dcb286e48e226cbccbbb666ed84e8cd446d66b24fc033d670807544bd7ad7ca774772739ef08421d8a3310
SSDEEP

3072:6La94GN7fiIEAeLHJx0PUZFvoJn7c4/bY+lAhKiTCQlJL:6La94GN7fiIEAeLHJx0cTQJn7cnKiOQP

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 3 IoCs

resource	yara_rule
behavioral2/memory/388-2-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/388-4-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/388-9-0x0000000000400000-0x0000000000414000-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	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4976 set thread context of 388	4976	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe	85

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 2 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	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
388	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
388	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
388	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
388	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
388	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
388	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
388	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
388	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4976	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
388	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4976 wrote to memory of 388	4976	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe	85
PID 4976 wrote to memory of 388	4976	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe	85
PID 4976 wrote to memory of 388	4976	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe	85
PID 4976 wrote to memory of 388	4976	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe	85
PID 4976 wrote to memory of 388	4976	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe	85
PID 4976 wrote to memory of 388	4976	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe	85
PID 4976 wrote to memory of 388	4976	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe	85
PID 4976 wrote to memory of 388	4976	cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe	85

C:\Users\Admin\AppData\Local\Temp\cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe"
1⤵
- 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:4976
- C:\Users\Admin\AppData\Local\Temp\cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\cb51b706cbcb7d64cf679468e099b9af_JaffaCakes118.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  PID:388

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

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

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

memory/388-2-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/388-4-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/388-9-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download