isrstealer | 242ba0418ae3e544594fae7e6e911a638fa26e2dbfedab47f2c58c004201dde6

General

Target

b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe
Size

620KB
MD5

b8a0902264c0e35b11085ac2e8222790
SHA1

42eceb7e2fd9ab7f94ae7d9df84491416cf36bc7
SHA256

242ba0418ae3e544594fae7e6e911a638fa26e2dbfedab47f2c58c004201dde6
SHA512

e1237fac5d3754b469b54201bfff718abd7f661c2ae7135232ac174b5650fd7e6716f4cdef87e3098bcecb2309e64371e16559fec634ee2b71c3f66b1b8e4b83
SSDEEP

12288:Y6kFDX8vJcK4T9ysNOr4AgzC2s46tIfEB9l9gBILCVG:NkFDMvv4ss0V6C2s4VfEB9l9gBw

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
behavioral1/memory/1620-26-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/1620-22-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/1620-34-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/1620-38-0x0000000000400000-0x0000000000414000-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	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2900 set thread context of 1720	2900	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	31
PID 1720 set thread context of 1620	1720	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	32

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	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1620	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe
1620	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe
1620	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe
1620	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2900	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe
1720	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe
1620	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 2900 wrote to memory of 1720	2900	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	31
PID 2900 wrote to memory of 1720	2900	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	31
PID 2900 wrote to memory of 1720	2900	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	31
PID 2900 wrote to memory of 1720	2900	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	31
PID 2900 wrote to memory of 1720	2900	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	31
PID 2900 wrote to memory of 1720	2900	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	31
PID 2900 wrote to memory of 1720	2900	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	31
PID 2900 wrote to memory of 1720	2900	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	31
PID 2900 wrote to memory of 1720	2900	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	31
PID 1720 wrote to memory of 1620	1720	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	32
PID 1720 wrote to memory of 1620	1720	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	32
PID 1720 wrote to memory of 1620	1720	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	32
PID 1720 wrote to memory of 1620	1720	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	32
PID 1720 wrote to memory of 1620	1720	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	32
PID 1720 wrote to memory of 1620	1720	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	32
PID 1720 wrote to memory of 1620	1720	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	32
PID 1720 wrote to memory of 1620	1720	b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe	32

C:\Users\Admin\AppData\Local\Temp\b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b8a0902264c0e35b11085ac2e8222790_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\b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\b8a0902264c0e35b11085ac2e8222790_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:1720
- - C:\Users\Admin\AppData\Local\Temp\b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe
    "C:\Users\Admin\AppData\Local\Temp\b8a0902264c0e35b11085ac2e8222790_JaffaCakes118.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:1620

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/1620-22-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/1620-18-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/1620-26-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/1620-20-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/1620-34-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/1620-38-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/1720-15-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/1720-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1720-6-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/1720-4-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/1720-2-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/1720-31-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/1720-12-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads