isrstealer | a4c3779c665ff0b55ad100d952211b8a0d7d063764ad85811e239124535d6cc9

Analysis

max time kernel
122s
max time network
125s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
31-12-2023 07:46

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General

Target

2de955495a987336b32f27d3e84d8c1a.exe
Size

205KB
MD5

2de955495a987336b32f27d3e84d8c1a
SHA1

7609b0324872ebdd2e74f485ca0bba8dfa30cff9
SHA256

a4c3779c665ff0b55ad100d952211b8a0d7d063764ad85811e239124535d6cc9
SHA512

8b717fd9da4d56f5a680b82822c8c063f7766d5f6d45fd90c0850852594e5ccb722c2528945a08497c672764919dacdcb666463f1bbd2f5075212c5393b3c59a
SSDEEP

3072:JM2kKQtv3vwsyclCPCRnglKDqvTQCfzRaPP8/eR:oJv/ws6PCBgkDSYF

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 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2680-4-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/2680-10-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/2680-13-0x0000000000400000-0x0000000000414000-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

T1547.001

Modify Registry

T1112

Processes:

2de955495a987336b32f27d3e84d8c1a.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2444714103-3190537498-3629098939-1000\Software\Microsoft\Windows\CurrentVersion\Run\Windows = "C:\\Users\\Admin\\AppData\\Roaming\\polo.exe"	2de955495a987336b32f27d3e84d8c1a.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

2de955495a987336b32f27d3e84d8c1a.exe

description pid process target process

PID 2672 set thread context of 2680 2672 2de955495a987336b32f27d3e84d8c1a.exe vbc.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

vbc.exe

pid process

2680 vbc.exe
2680 vbc.exe
2680 vbc.exe
2680 vbc.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

vbc.exe

pid process

2680 vbc.exe

description	pid	process	target process
PID 2672 set thread context of 2680	2672	2de955495a987336b32f27d3e84d8c1a.exe	vbc.exe

pid	process
2680	vbc.exe
2680	vbc.exe
2680	vbc.exe
2680	vbc.exe

pid	process
2680	vbc.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

2de955495a987336b32f27d3e84d8c1a.exe

description	pid	process	target process
PID 2672 wrote to memory of 2680	2672	2de955495a987336b32f27d3e84d8c1a.exe	vbc.exe
PID 2672 wrote to memory of 2680	2672	2de955495a987336b32f27d3e84d8c1a.exe	vbc.exe
PID 2672 wrote to memory of 2680	2672	2de955495a987336b32f27d3e84d8c1a.exe	vbc.exe
PID 2672 wrote to memory of 2680	2672	2de955495a987336b32f27d3e84d8c1a.exe	vbc.exe
PID 2672 wrote to memory of 2680	2672	2de955495a987336b32f27d3e84d8c1a.exe	vbc.exe
PID 2672 wrote to memory of 2680	2672	2de955495a987336b32f27d3e84d8c1a.exe	vbc.exe
PID 2672 wrote to memory of 2680	2672	2de955495a987336b32f27d3e84d8c1a.exe	vbc.exe
PID 2672 wrote to memory of 2680	2672	2de955495a987336b32f27d3e84d8c1a.exe	vbc.exe
PID 2672 wrote to memory of 2680	2672	2de955495a987336b32f27d3e84d8c1a.exe	vbc.exe

C:\Users\Admin\AppData\Local\Temp\2de955495a987336b32f27d3e84d8c1a.exe
"C:\Users\Admin\AppData\Local\Temp\2de955495a987336b32f27d3e84d8c1a.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2672
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  PID:2680

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scripting

T1064

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

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/2672-0-0x0000000074C90000-0x000000007523B000-memory.dmp

Filesize
5.7MB

Download
memory/2672-1-0x0000000074C90000-0x000000007523B000-memory.dmp

Filesize
5.7MB

Download
memory/2672-2-0x0000000000E70000-0x0000000000EB0000-memory.dmp

Filesize
256KB

Download
memory/2672-7-0x0000000074C90000-0x000000007523B000-memory.dmp

Filesize
5.7MB

Download
memory/2680-4-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2680-10-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2680-12-0x0000000000420000-0x00000000004FF000-memory.dmp

Filesize
892KB

Download
memory/2680-13-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download