isrstealer | 35ea182146f23e39d24edd289814d5f15e0d0f33ed4836be1cb58930449c5f63

General

Target

JaffaCakes118_157a88635922a956ad4166acfe537610.exe
Size

120KB
MD5

157a88635922a956ad4166acfe537610
SHA1

546b2416065b7227dc949296dd85eacc0b1b6b4e
SHA256

35ea182146f23e39d24edd289814d5f15e0d0f33ed4836be1cb58930449c5f63
SHA512

78b462c1c9830218029f08fae6a3e90b21b1d27f05d1ba0c66f717a2ef5e6c7dadb592aab91697ec2e1cc9a96eafe8498fa696bf6c0e33149fca62432fdd6cab
SSDEEP

3072:6La94GN7fiIEAeLHJx0snnczgbCn7BDdtMd8WhWuFOPMI/2WddUXE:6La94GN7fiIEAeLHJx0WCntdtMieZg0A

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/4128-2-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/4128-4-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/4128-8-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/4128-9-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer

Isrstealer 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 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 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	JaffaCakes118_157a88635922a956ad4166acfe537610.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3400 set thread context of 4128	3400	JaffaCakes118_157a88635922a956ad4166acfe537610.exe	82

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	JaffaCakes118_157a88635922a956ad4166acfe537610.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_157a88635922a956ad4166acfe537610.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4128	JaffaCakes118_157a88635922a956ad4166acfe537610.exe
4128	JaffaCakes118_157a88635922a956ad4166acfe537610.exe
4128	JaffaCakes118_157a88635922a956ad4166acfe537610.exe
4128	JaffaCakes118_157a88635922a956ad4166acfe537610.exe
4128	JaffaCakes118_157a88635922a956ad4166acfe537610.exe
4128	JaffaCakes118_157a88635922a956ad4166acfe537610.exe
4128	JaffaCakes118_157a88635922a956ad4166acfe537610.exe
4128	JaffaCakes118_157a88635922a956ad4166acfe537610.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3400	JaffaCakes118_157a88635922a956ad4166acfe537610.exe
4128	JaffaCakes118_157a88635922a956ad4166acfe537610.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3400 wrote to memory of 4128	3400	JaffaCakes118_157a88635922a956ad4166acfe537610.exe	82
PID 3400 wrote to memory of 4128	3400	JaffaCakes118_157a88635922a956ad4166acfe537610.exe	82
PID 3400 wrote to memory of 4128	3400	JaffaCakes118_157a88635922a956ad4166acfe537610.exe	82
PID 3400 wrote to memory of 4128	3400	JaffaCakes118_157a88635922a956ad4166acfe537610.exe	82
PID 3400 wrote to memory of 4128	3400	JaffaCakes118_157a88635922a956ad4166acfe537610.exe	82
PID 3400 wrote to memory of 4128	3400	JaffaCakes118_157a88635922a956ad4166acfe537610.exe	82
PID 3400 wrote to memory of 4128	3400	JaffaCakes118_157a88635922a956ad4166acfe537610.exe	82
PID 3400 wrote to memory of 4128	3400	JaffaCakes118_157a88635922a956ad4166acfe537610.exe	82

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_157a88635922a956ad4166acfe537610.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_157a88635922a956ad4166acfe537610.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:3400
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_157a88635922a956ad4166acfe537610.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_157a88635922a956ad4166acfe537610.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  PID:4128

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

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

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/4128-2-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4128-4-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4128-8-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4128-9-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads