isrstealer | 9d1d5139eec7986e3554c669027350b567a1dc868ccdb7769113c116420de733

Analysis

max time kernel
81s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
19-10-2022 16:01

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General

Target

9d1d5139eec7986e3554c669027350b567a1dc868ccdb7769113c116420de733.exe
Size

679KB
MD5

91f3a7be84c65567899829e17ec42b7c
SHA1

5b3d422e2339d4bc7f38a186669f2f74d8a0bd7f
SHA256

9d1d5139eec7986e3554c669027350b567a1dc868ccdb7769113c116420de733
SHA512

3e5855a2c67b52dc58fa012c23b0d851efde4628276273b2dd86f5d4d6438535c757a57f532b5dbea755cad2c32376192b286fcfa3cc41019875a1971886578f
SSDEEP

12288:jhRwPIdIDQUFVO9nOq1ycwfzPprfQiFrL/Tyumdr22AKxX:EXDQUFCbnc7QYFwx

Score

10^/10

isrstealer collection stealer trojan upx

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

resource	yara_rule
behavioral2/memory/1964-137-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/1964-146-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/1964-159-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4884-163-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4884-165-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/2620-148-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/2620-152-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/2620-161-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

Nirsoft 7 IoCs

resource	yara_rule
behavioral2/memory/2620-148-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/2620-152-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/1944-158-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/4884-163-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1944-164-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/4884-165-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/2620-161-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft

Executes dropped EXE 1 IoCs

pid	Process
2236	MSP Code Generator.exe

UPX packed file 8 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/1944-151-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/4884-156-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1944-158-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/4884-163-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1944-164-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/4884-165-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4884-160-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1944-155-0x0000000000400000-0x0000000000426000-memory.dmp	upx

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	9d1d5139eec7986e3554c669027350b567a1dc868ccdb7769113c116420de733.exe

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 2236 set thread context of 1964	2236	MSP Code Generator.exe	85
PID 1964 set thread context of 2300	1964	vbc.exe	86
PID 2300 set thread context of 2620	2300	vbc.exe	87
PID 2300 set thread context of 1944	2300	vbc.exe	88
PID 2300 set thread context of 4884	2300	vbc.exe	89

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
1964	vbc.exe
1964	vbc.exe
1964	vbc.exe
1964	vbc.exe
1964	vbc.exe
1964	vbc.exe
1964	vbc.exe
1964	vbc.exe
1944	vbc.exe
1944	vbc.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1944	vbc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1964	vbc.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 4300 wrote to memory of 2236	4300	9d1d5139eec7986e3554c669027350b567a1dc868ccdb7769113c116420de733.exe	84
PID 4300 wrote to memory of 2236	4300	9d1d5139eec7986e3554c669027350b567a1dc868ccdb7769113c116420de733.exe	84
PID 4300 wrote to memory of 2236	4300	9d1d5139eec7986e3554c669027350b567a1dc868ccdb7769113c116420de733.exe	84
PID 2236 wrote to memory of 1964	2236	MSP Code Generator.exe	85
PID 2236 wrote to memory of 1964	2236	MSP Code Generator.exe	85
PID 2236 wrote to memory of 1964	2236	MSP Code Generator.exe	85
PID 2236 wrote to memory of 1964	2236	MSP Code Generator.exe	85
PID 2236 wrote to memory of 1964	2236	MSP Code Generator.exe	85
PID 2236 wrote to memory of 1964	2236	MSP Code Generator.exe	85
PID 2236 wrote to memory of 1964	2236	MSP Code Generator.exe	85
PID 2236 wrote to memory of 1964	2236	MSP Code Generator.exe	85
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 1964 wrote to memory of 2300	1964	vbc.exe	86
PID 2300 wrote to memory of 2620	2300	vbc.exe	87
PID 2300 wrote to memory of 2620	2300	vbc.exe	87
PID 2300 wrote to memory of 2620	2300	vbc.exe	87
PID 2300 wrote to memory of 2620	2300	vbc.exe	87
PID 2300 wrote to memory of 2620	2300	vbc.exe	87
PID 2300 wrote to memory of 1944	2300	vbc.exe	88
PID 2300 wrote to memory of 1944	2300	vbc.exe	88
PID 2300 wrote to memory of 1944	2300	vbc.exe	88
PID 2300 wrote to memory of 1944	2300	vbc.exe	88
PID 2300 wrote to memory of 1944	2300	vbc.exe	88
PID 2300 wrote to memory of 4884	2300	vbc.exe	89
PID 2300 wrote to memory of 4884	2300	vbc.exe	89
PID 2300 wrote to memory of 4884	2300	vbc.exe	89
PID 2300 wrote to memory of 4884	2300	vbc.exe	89
PID 2300 wrote to memory of 4884	2300	vbc.exe	89

C:\Users\Admin\AppData\Local\Temp\9d1d5139eec7986e3554c669027350b567a1dc868ccdb7769113c116420de733.exe
"C:\Users\Admin\AppData\Local\Temp\9d1d5139eec7986e3554c669027350b567a1dc868ccdb7769113c116420de733.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4300
- C:\Users\Admin\AppData\Local\Temp\MSP Code Generator.exe
  "C:\Users\Admin\AppData\Local\Temp\MSP Code Generator.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:2236
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1964
  - - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
      "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe"
      4⤵
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:2300
    - - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
        
        "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp
        5⤵
        
        PID:2620
    - - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
        
        "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data1.dmp
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1944
    - - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
        
        "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data2.dmp
        5⤵
        Accesses Microsoft Outlook accounts
        
        PID:4884

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

T1064

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\MSP Code Generator.exe

Filesize
608KB

MD5
a034902b1c3c004ac6bf644b3a80b032

SHA1
ff870df2a0ad71ce52fc36b9149cf2803c69805c

SHA256
7f05710ced5bc4111bad29e153fc3358bd244a389d3174037e9a2f5c2062388e

SHA512
8b86d642113c4fa6c142cea03bc8ec76f7849d495b0be8554d123caa26998778c86c4ae5645b9717781980f09603dd814f0ddef5695662d3f6ab897a2f10dce7

Download Submit
C:\Users\Admin\AppData\Local\Temp\MSP Code Generator.exe

Filesize
608KB

MD5
a034902b1c3c004ac6bf644b3a80b032

SHA1
ff870df2a0ad71ce52fc36b9149cf2803c69805c

SHA256
7f05710ced5bc4111bad29e153fc3358bd244a389d3174037e9a2f5c2062388e

SHA512
8b86d642113c4fa6c142cea03bc8ec76f7849d495b0be8554d123caa26998778c86c4ae5645b9717781980f09603dd814f0ddef5695662d3f6ab897a2f10dce7

Download Submit
memory/1944-151-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1944-158-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1944-155-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1944-164-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1964-146-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1964-137-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1964-159-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/2236-135-0x0000000075300000-0x00000000758B1000-memory.dmp

Filesize
5.7MB

Download
memory/2236-140-0x0000000075300000-0x00000000758B1000-memory.dmp

Filesize
5.7MB

Download
memory/2300-144-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2300-143-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2300-145-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2300-162-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2620-148-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/2620-152-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/2620-161-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/4884-156-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4884-165-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4884-163-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4884-160-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download