isrstealer | 35fa115c88bb5ef8b052a9c4b2591ef64d9675c32b1930d3880284e01606a2da

General

Target

2d6103930ec97190c4afb291471267b0.exe
Size

328KB
MD5

2d6103930ec97190c4afb291471267b0
SHA1

07ba29465901f13747af81d4e0818148b9299ac3
SHA256

35fa115c88bb5ef8b052a9c4b2591ef64d9675c32b1930d3880284e01606a2da
SHA512

110a7fe0272dd2d39082fc8b313eb348b605b44c618361bd20a372ebc478e4512ee330ad44650a298e585bcf01645c67a6abfc2918bd5ec4aec86cb600a44ebc
SSDEEP

3072:OpmptfrOLUS2DBb+QeA9uXPD2zbY9iCZrZ4XGD4fIE/nZMLwnh:OpmptjOLUS2DBCxKzbYMtWD8IgnZMLw

Score

10^/10

isrstealer bootkit 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 6 IoCs

resource	yara_rule
behavioral1/memory/2292-22-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/2292-26-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/2292-31-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/2292-35-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/2292-37-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/2292-38-0x0000000000400000-0x0000000000414000-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	2d6103930ec97190c4afb291471267b0.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2552 set thread context of 332	2552	2d6103930ec97190c4afb291471267b0.exe	29
PID 332 set thread context of 2292	332	2d6103930ec97190c4afb291471267b0.exe	30

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2292	2d6103930ec97190c4afb291471267b0.exe
2292	2d6103930ec97190c4afb291471267b0.exe
2292	2d6103930ec97190c4afb291471267b0.exe
2292	2d6103930ec97190c4afb291471267b0.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2552	2d6103930ec97190c4afb291471267b0.exe
332	2d6103930ec97190c4afb291471267b0.exe
2292	2d6103930ec97190c4afb291471267b0.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 2552 wrote to memory of 332	2552	2d6103930ec97190c4afb291471267b0.exe	29
PID 2552 wrote to memory of 332	2552	2d6103930ec97190c4afb291471267b0.exe	29
PID 2552 wrote to memory of 332	2552	2d6103930ec97190c4afb291471267b0.exe	29
PID 2552 wrote to memory of 332	2552	2d6103930ec97190c4afb291471267b0.exe	29
PID 2552 wrote to memory of 332	2552	2d6103930ec97190c4afb291471267b0.exe	29
PID 2552 wrote to memory of 332	2552	2d6103930ec97190c4afb291471267b0.exe	29
PID 2552 wrote to memory of 332	2552	2d6103930ec97190c4afb291471267b0.exe	29
PID 2552 wrote to memory of 332	2552	2d6103930ec97190c4afb291471267b0.exe	29
PID 2552 wrote to memory of 332	2552	2d6103930ec97190c4afb291471267b0.exe	29
PID 332 wrote to memory of 2292	332	2d6103930ec97190c4afb291471267b0.exe	30
PID 332 wrote to memory of 2292	332	2d6103930ec97190c4afb291471267b0.exe	30
PID 332 wrote to memory of 2292	332	2d6103930ec97190c4afb291471267b0.exe	30
PID 332 wrote to memory of 2292	332	2d6103930ec97190c4afb291471267b0.exe	30
PID 332 wrote to memory of 2292	332	2d6103930ec97190c4afb291471267b0.exe	30
PID 332 wrote to memory of 2292	332	2d6103930ec97190c4afb291471267b0.exe	30
PID 332 wrote to memory of 2292	332	2d6103930ec97190c4afb291471267b0.exe	30
PID 332 wrote to memory of 2292	332	2d6103930ec97190c4afb291471267b0.exe	30

C:\Users\Admin\AppData\Local\Temp\2d6103930ec97190c4afb291471267b0.exe
"C:\Users\Admin\AppData\Local\Temp\2d6103930ec97190c4afb291471267b0.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2552
- C:\Users\Admin\AppData\Local\Temp\2d6103930ec97190c4afb291471267b0.exe
  "C:\Users\Admin\AppData\Local\Temp\2d6103930ec97190c4afb291471267b0.exe"
  2⤵
  - Writes to the Master Boot Record (MBR)
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:332
- - C:\Users\Admin\AppData\Local\Temp\2d6103930ec97190c4afb291471267b0.exe
    "C:\Users\Admin\AppData\Local\Temp\2d6103930ec97190c4afb291471267b0.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:2292

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

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/332-32-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/332-12-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/332-33-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/332-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/332-2-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/332-14-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/332-17-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/332-4-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/332-6-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2292-26-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2292-20-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2292-31-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2292-22-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2292-18-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2292-35-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2292-37-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2292-38-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads