isrstealer | ea4eb55ebf7e14785d300fbb24be2bdea633c4b78b69fe5fccf77a16cab5cccd

Analysis

max time kernel
151s
max time network
171s
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
MD5

d4bb706e3e461f1ccf390fc2fc786faf
SHA1

94b8dee04b501862d4b66f376a806ccaaebb4122
SHA256

ac2cfb961139a24edca708958b6f6a72666f3f711696065435fcf169bee64a56
SHA512

384a5639ed3e9074600430183634ba7bd52b26190041241012970e164dc6f08e6b4eef5f8d4ba9ab4ff79ad01cd08ed93e7f7e0b62662a5cce80fb2b80dee3cb
SSDEEP

12288:xZNq9Q5uxGnhiqti9tb/eT3BK/AMKEOL+:xua2GnUqtYyT8/xOL+

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/4256-137-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral4/memory/4256-141-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral4/memory/4256-156-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral4/memory/4256-157-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral4/memory/924-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral4/memory/924-155-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral4/memory/924-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral4/memory/924-155-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral4/memory/4524-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral4/memory/4524-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral4/memory/4524-147-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral4/memory/4524-148-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral4/memory/924-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral4/memory/924-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral4/memory/924-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral4/memory/924-155-0x0000000000400000-0x000000000041F000-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-1-5-21-2629973501-4017243118-3254762364-1000\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-1-5-21-2629973501-4017243118-3254762364-1000\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-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\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 1180 set thread context of 4256	1180	Samples.jpg.exe	88
PID 4256 set thread context of 4524	4256	cvtres.exe	89
PID 4256 set thread context of 924	4256	cvtres.exe	94

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
1180	Samples.jpg.exe
1180	Samples.jpg.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1180	Samples.jpg.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4256	cvtres.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 1180 wrote to memory of 4284	1180	Samples.jpg.exe	85
PID 1180 wrote to memory of 4284	1180	Samples.jpg.exe	85
PID 1180 wrote to memory of 4284	1180	Samples.jpg.exe	85
PID 4284 wrote to memory of 444	4284	cmd.exe	87
PID 4284 wrote to memory of 444	4284	cmd.exe	87
PID 4284 wrote to memory of 444	4284	cmd.exe	87
PID 1180 wrote to memory of 4256	1180	Samples.jpg.exe	88
PID 1180 wrote to memory of 4256	1180	Samples.jpg.exe	88
PID 1180 wrote to memory of 4256	1180	Samples.jpg.exe	88
PID 1180 wrote to memory of 4256	1180	Samples.jpg.exe	88
PID 1180 wrote to memory of 4256	1180	Samples.jpg.exe	88
PID 1180 wrote to memory of 4256	1180	Samples.jpg.exe	88
PID 1180 wrote to memory of 4256	1180	Samples.jpg.exe	88
PID 4256 wrote to memory of 4524	4256	cvtres.exe	89
PID 4256 wrote to memory of 4524	4256	cvtres.exe	89
PID 4256 wrote to memory of 4524	4256	cvtres.exe	89
PID 4256 wrote to memory of 4524	4256	cvtres.exe	89
PID 4256 wrote to memory of 4524	4256	cvtres.exe	89
PID 4256 wrote to memory of 4524	4256	cvtres.exe	89
PID 4256 wrote to memory of 4524	4256	cvtres.exe	89
PID 4256 wrote to memory of 4524	4256	cvtres.exe	89
PID 4256 wrote to memory of 924	4256	cvtres.exe	94
PID 4256 wrote to memory of 924	4256	cvtres.exe	94
PID 4256 wrote to memory of 924	4256	cvtres.exe	94
PID 4256 wrote to memory of 924	4256	cvtres.exe	94
PID 4256 wrote to memory of 924	4256	cvtres.exe	94
PID 4256 wrote to memory of 924	4256	cvtres.exe	94
PID 4256 wrote to memory of 924	4256	cvtres.exe	94
PID 4256 wrote to memory of 924	4256	cvtres.exe	94

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:1180
- 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:4284
- - 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:444
- 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:4256
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\nmq16teM2Y.ini"
    3⤵
    PID:4524
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\T8CooeKiVj.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:924

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

C:\Users\Admin\AppData\Local\Temp\nmq16teM2Y.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/924-155-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/924-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/924-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/924-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1180-133-0x0000000074E40000-0x00000000753F1000-memory.dmp

Filesize
5.7MB

Download
memory/1180-132-0x0000000074E40000-0x00000000753F1000-memory.dmp

Filesize
5.7MB

Download
memory/1180-139-0x0000000074E40000-0x00000000753F1000-memory.dmp

Filesize
5.7MB

Download
memory/4256-137-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4256-141-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4256-156-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4256-157-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4524-147-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4524-148-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4524-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4524-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download