isrstealer | 7515891da490d8fb807fa68ea40e27d0fb25a111c17b5a06cafe770f74c51599

Analysis

max time kernel
134s
max time network
166s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
01/10/2022, 22:36

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General

Target
Samples.jpg.exe
Size 392KB
Sample221001-2jhfssadb8
SHA256 ac2cfb961139a24edca708958b6f6a72666f3f711696065435fcf169bee64a56
MD5 d4bb706e3e461f1ccf390fc2fc786faf
SHA1 94b8dee04b501862d4b66f376a806ccaaebb4122
SHA512 384a5639ed3e9074600430183634ba7bd52b26190041241012970e164dc6f08e6b4eef5f8d4ba9ab4ff79ad01cd08ed93e7f7e0b62662a5cce80fb2b80dee3cb
SSDEEP 12288:xZNq9Q5uxGnhiqti9tb/eT3BK/AMKEOL+:xua2GnUqtYyT8/xOL+
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

isrstealer collection persistence 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 4 IoCs

resource	yara_rule
behavioral4/memory/3556-137-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral4/memory/3556-147-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral4/memory/3556-157-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral4/memory/3556-158-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral4/memory/2692-155-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral4/memory/2692-156-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral4/memory/2692-155-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral4/memory/2692-156-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral4/memory/4252-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral4/memory/4252-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral4/memory/4252-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral4/memory/4252-148-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral4/memory/4252-149-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral4/memory/2692-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral4/memory/2692-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral4/memory/2692-155-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral4/memory/2692-156-0x0000000000400000-0x000000000041F000-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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	Samples.jpg.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	cvtres.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XGdES9N8RW = "C:\\Users\\Admin\\AppData\\Roaming\\dGNIWZiH\\seb2plM.exe.lnk"	reg.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2264 set thread context of 3556	2264	Samples.jpg.exe	89
PID 3556 set thread context of 4252	3556	cvtres.exe	90
PID 3556 set thread context of 2692	3556	cvtres.exe	91

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 2 IoCs

pid	Process
2264	Samples.jpg.exe
2264	Samples.jpg.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2264	Samples.jpg.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3556	cvtres.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 2264 wrote to memory of 2788	2264	Samples.jpg.exe	86
PID 2264 wrote to memory of 2788	2264	Samples.jpg.exe	86
PID 2264 wrote to memory of 2788	2264	Samples.jpg.exe	86
PID 2788 wrote to memory of 3928	2788	cmd.exe	88
PID 2788 wrote to memory of 3928	2788	cmd.exe	88
PID 2788 wrote to memory of 3928	2788	cmd.exe	88
PID 2264 wrote to memory of 3556	2264	Samples.jpg.exe	89
PID 2264 wrote to memory of 3556	2264	Samples.jpg.exe	89
PID 2264 wrote to memory of 3556	2264	Samples.jpg.exe	89
PID 2264 wrote to memory of 3556	2264	Samples.jpg.exe	89
PID 2264 wrote to memory of 3556	2264	Samples.jpg.exe	89
PID 2264 wrote to memory of 3556	2264	Samples.jpg.exe	89
PID 2264 wrote to memory of 3556	2264	Samples.jpg.exe	89
PID 3556 wrote to memory of 4252	3556	cvtres.exe	90
PID 3556 wrote to memory of 4252	3556	cvtres.exe	90
PID 3556 wrote to memory of 4252	3556	cvtres.exe	90
PID 3556 wrote to memory of 4252	3556	cvtres.exe	90
PID 3556 wrote to memory of 4252	3556	cvtres.exe	90
PID 3556 wrote to memory of 4252	3556	cvtres.exe	90
PID 3556 wrote to memory of 4252	3556	cvtres.exe	90
PID 3556 wrote to memory of 4252	3556	cvtres.exe	90
PID 3556 wrote to memory of 2692	3556	cvtres.exe	91
PID 3556 wrote to memory of 2692	3556	cvtres.exe	91
PID 3556 wrote to memory of 2692	3556	cvtres.exe	91
PID 3556 wrote to memory of 2692	3556	cvtres.exe	91
PID 3556 wrote to memory of 2692	3556	cvtres.exe	91
PID 3556 wrote to memory of 2692	3556	cvtres.exe	91
PID 3556 wrote to memory of 2692	3556	cvtres.exe	91
PID 3556 wrote to memory of 2692	3556	cvtres.exe	91

C:\Users\Admin\AppData\Local\Temp\Samples.jpg.exe
"C:\Users\Admin\AppData\Local\Temp\Samples.jpg.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2264
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /f /v "XGdES9N8RW" /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\dGNIWZiH\seb2plM.exe.lnk"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2788
- - C:\Windows\SysWOW64\reg.exe
    reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /f /v "XGdES9N8RW" /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\dGNIWZiH\seb2plM.exe.lnk"
    3⤵
    - Adds Run key to start application
    PID:3928
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3556
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\H2rZeijUYE.ini"
    3⤵
    PID:4252
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\yHtKOYk4YA.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:2692

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

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

H2rZeijUYE.ini

Path C:\Users\Admin\AppData\Local\Temp\H2rZeijUYE.ini
Size 5B
SHA256 fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba
MD5 d1ea279fb5559c020a1b4137dc4de237
SHA1 db6f8988af46b56216a6f0daf95ab8c9bdb57400
SHA512 720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3
MD5 SHA1 SHA512

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memory/2264-133-0x0000000074E80000-0x0000000075431000-memory.dmp

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memory/2264-132-0x0000000074E80000-0x0000000075431000-memory.dmp

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memory/2264-139-0x0000000074E80000-0x0000000075431000-memory.dmp

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memory/2692-156-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2692-155-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2692-154-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2692-152-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/3556-137-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/3556-147-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/3556-157-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/3556-158-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/4252-148-0x0000000000400000-0x0000000000453000-memory.dmp

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memory/4252-149-0x0000000000400000-0x0000000000453000-memory.dmp

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memory/4252-146-0x0000000000400000-0x0000000000453000-memory.dmp

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memory/4252-145-0x0000000000400000-0x0000000000453000-memory.dmp

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memory/4252-143-0x0000000000400000-0x0000000000453000-memory.dmp

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