isrstealer | a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9

Analysis

max time kernel
91s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
06-12-2022 20:47

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General

Target

a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe
Size

258KB
MD5

0b0876ba39bc777d1f06ee285b64f29a
SHA1

9ddd982d9cfdbf838a931f7769b613117c144043
SHA256

a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9
SHA512

2c50fc1541beb169f861e50b0181734c30c9b87216e05093da680ac37b8775923ffa282f0dfef3c9c3da887325c3b8e5312ea8c52cd8b2864acfe1cc783435ea
SSDEEP

3072:SzmLkZ7Dmi9qyonfftoUvTOZYFoO6ovQyaTOvn3qUM7JIud2kc1gBPQW+hKqfS7:gfIyonfjiGFo0IyPvn3n4yLkLBPQW+f

Score

10^/10

isrstealer persistence 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 1 IoCs

resource	yara_rule
behavioral2/memory/4900-133-0x0000000000400000-0x0000000000412000-memory.dmp	family_isrstealer

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Java Update = "C:\\Users\\Admin\\AppData\\Local\\Temp\\jCKzfabZePJQtVGWad.exe"	a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4788 set thread context of 4900	4788	a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe	81

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4900	vbc.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4788 wrote to memory of 4900	4788	a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe	81
PID 4788 wrote to memory of 4900	4788	a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe	81
PID 4788 wrote to memory of 4900	4788	a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe	81
PID 4788 wrote to memory of 4900	4788	a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe	81
PID 4788 wrote to memory of 4900	4788	a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe	81
PID 4788 wrote to memory of 4900	4788	a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe	81
PID 4788 wrote to memory of 4900	4788	a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe	81
PID 4788 wrote to memory of 4900	4788	a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe	81

C:\Users\Admin\AppData\Local\Temp\a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe
"C:\Users\Admin\AppData\Local\Temp\a16ab86b4556c174f4a6c3a6d7f1de6b4635aaffd3db3907d7256adab6ad4ee9.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4788
- C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  2⤵
  - Suspicious use of SetWindowsHookEx
  PID:4900

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

T1064

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Scripting

T1064

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/4788-137-0x00000000753F0000-0x00000000759A1000-memory.dmp

Filesize
5.7MB

Download
memory/4900-133-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

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