isrstealer | 966c8b6ae047e13474bf29b3cd01584730c94f54b942b50b6346639c798ea585

Analysis

max time kernel
72s
max time network
137s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
25-11-2022 17:02

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General

Target

966c8b6ae047e13474bf29b3cd01584730c94f54b942b50b6346639c798ea585.exe
Size

420KB
MD5

e774bca504985440420fe73b75dc00cc
SHA1

368fa03327594d06b8e421b74b1de49bf0780de9
SHA256

966c8b6ae047e13474bf29b3cd01584730c94f54b942b50b6346639c798ea585
SHA512

245416bdff73f6d133ecd33d514a77ce1e9ab88226dcb731581bae923d1c1feab66a5364e3670b91d4840e5b80771cd551d632c6c200b002153bce3164381761
SSDEEP

6144:D/VmalBrqaKxs+j26ld4h6LpNkVTqgL4/YitLJuTtnQoniQGZpvIszTuoFZL:RmOHK9KVTqgLaYitLUTyNQo1Tuo

Score

10^/10

isrstealer collection persistence spyware 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 7 IoCs

resource	yara_rule
behavioral2/memory/856-138-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/856-140-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/856-142-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral2/memory/856-145-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/856-155-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/856-164-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/856-165-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/5112-162-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/5112-163-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/5112-162-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/5112-163-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 5 IoCs

pid	Process
4908	winlogon.exe
4876	winlogon.exe
856	winlogon.exe
5088	winlogon.exe
5112	winlogon.exe

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/5088-149-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5088-152-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5088-153-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5088-154-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5112-158-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/5112-161-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/5112-162-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/5112-163-0x0000000000400000-0x000000000041F000-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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	966c8b6ae047e13474bf29b3cd01584730c94f54b942b50b6346639c798ea585.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

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	winlogon.exe

Adds Run key to start application 2 TTPs 2 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\Winlogon = "C:\\Users\\Admin\\AppData\\Roaming\\SubFolder\\SubFolder\\winlogon.exe"	winlogon.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Winlogon = "C:\\Users\\Admin\\AppData\\Roaming\\SubFolder\\SubFolder\\winlogon.exe"	winlogon.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4908 set thread context of 856	4908	winlogon.exe	82
PID 856 set thread context of 5088	856	winlogon.exe	84
PID 856 set thread context of 5112	856	winlogon.exe	85

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

System Information Discovery
T1082

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
856	winlogon.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 3392 wrote to memory of 4908	3392	966c8b6ae047e13474bf29b3cd01584730c94f54b942b50b6346639c798ea585.exe	80
PID 3392 wrote to memory of 4908	3392	966c8b6ae047e13474bf29b3cd01584730c94f54b942b50b6346639c798ea585.exe	80
PID 4908 wrote to memory of 4876	4908	winlogon.exe	81
PID 4908 wrote to memory of 4876	4908	winlogon.exe	81
PID 4908 wrote to memory of 4876	4908	winlogon.exe	81
PID 4908 wrote to memory of 856	4908	winlogon.exe	82
PID 4908 wrote to memory of 856	4908	winlogon.exe	82
PID 4908 wrote to memory of 856	4908	winlogon.exe	82
PID 4908 wrote to memory of 856	4908	winlogon.exe	82
PID 4908 wrote to memory of 856	4908	winlogon.exe	82
PID 4908 wrote to memory of 856	4908	winlogon.exe	82
PID 4908 wrote to memory of 856	4908	winlogon.exe	82
PID 4908 wrote to memory of 856	4908	winlogon.exe	82
PID 856 wrote to memory of 5088	856	winlogon.exe	84
PID 856 wrote to memory of 5088	856	winlogon.exe	84
PID 856 wrote to memory of 5088	856	winlogon.exe	84
PID 856 wrote to memory of 5088	856	winlogon.exe	84
PID 856 wrote to memory of 5088	856	winlogon.exe	84
PID 856 wrote to memory of 5088	856	winlogon.exe	84
PID 856 wrote to memory of 5088	856	winlogon.exe	84
PID 856 wrote to memory of 5088	856	winlogon.exe	84
PID 856 wrote to memory of 5112	856	winlogon.exe	85
PID 856 wrote to memory of 5112	856	winlogon.exe	85
PID 856 wrote to memory of 5112	856	winlogon.exe	85
PID 856 wrote to memory of 5112	856	winlogon.exe	85
PID 856 wrote to memory of 5112	856	winlogon.exe	85
PID 856 wrote to memory of 5112	856	winlogon.exe	85
PID 856 wrote to memory of 5112	856	winlogon.exe	85
PID 856 wrote to memory of 5112	856	winlogon.exe	85

C:\Users\Admin\AppData\Local\Temp\966c8b6ae047e13474bf29b3cd01584730c94f54b942b50b6346639c798ea585.exe
"C:\Users\Admin\AppData\Local\Temp\966c8b6ae047e13474bf29b3cd01584730c94f54b942b50b6346639c798ea585.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3392
- C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
  "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:4908
- - C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe"
    3⤵
    - Executes dropped EXE
    PID:4876
- - C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:856
  - - C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\3eHcaZADFb.ini"
      4⤵
      Executes dropped EXE
      PID:5088
  - - C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\Wl5rRXOFd5.ini"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      PID:5112

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

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\3eHcaZADFb.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe

Filesize
4KB

MD5
e1190859ab4f21e58d1873afc1b3cff2

SHA1
50d4f9f444dba70b9918c4b812b5d9a098e0f867

SHA256
9b6f8344738cd1b954066a8099333dfa46c360700d8113312e8f1f6f22afcb73

SHA512
f3924e6b6002e9122c9465d23ff5a574268800078e9fe6011e0d62dca6113ffaf786fa46338a02288d8059e09ef0e79ac96d004dacabcb708291cf4376294a38

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe

Filesize
4KB

MD5
e1190859ab4f21e58d1873afc1b3cff2

SHA1
50d4f9f444dba70b9918c4b812b5d9a098e0f867

SHA256
9b6f8344738cd1b954066a8099333dfa46c360700d8113312e8f1f6f22afcb73

SHA512
f3924e6b6002e9122c9465d23ff5a574268800078e9fe6011e0d62dca6113ffaf786fa46338a02288d8059e09ef0e79ac96d004dacabcb708291cf4376294a38

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe

Filesize
4KB

MD5
e1190859ab4f21e58d1873afc1b3cff2

SHA1
50d4f9f444dba70b9918c4b812b5d9a098e0f867

SHA256
9b6f8344738cd1b954066a8099333dfa46c360700d8113312e8f1f6f22afcb73

SHA512
f3924e6b6002e9122c9465d23ff5a574268800078e9fe6011e0d62dca6113ffaf786fa46338a02288d8059e09ef0e79ac96d004dacabcb708291cf4376294a38

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\winlogon.exe

Filesize
4KB

MD5
e1190859ab4f21e58d1873afc1b3cff2

SHA1
50d4f9f444dba70b9918c4b812b5d9a098e0f867

SHA256
9b6f8344738cd1b954066a8099333dfa46c360700d8113312e8f1f6f22afcb73

SHA512
f3924e6b6002e9122c9465d23ff5a574268800078e9fe6011e0d62dca6113ffaf786fa46338a02288d8059e09ef0e79ac96d004dacabcb708291cf4376294a38

Download Submit
C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe

Filesize
420KB

MD5
e774bca504985440420fe73b75dc00cc

SHA1
368fa03327594d06b8e421b74b1de49bf0780de9

SHA256
966c8b6ae047e13474bf29b3cd01584730c94f54b942b50b6346639c798ea585

SHA512
245416bdff73f6d133ecd33d514a77ce1e9ab88226dcb731581bae923d1c1feab66a5364e3670b91d4840e5b80771cd551d632c6c200b002153bce3164381761

Download Submit
C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe

Filesize
420KB

MD5
e774bca504985440420fe73b75dc00cc

SHA1
368fa03327594d06b8e421b74b1de49bf0780de9

SHA256
966c8b6ae047e13474bf29b3cd01584730c94f54b942b50b6346639c798ea585

SHA512
245416bdff73f6d133ecd33d514a77ce1e9ab88226dcb731581bae923d1c1feab66a5364e3670b91d4840e5b80771cd551d632c6c200b002153bce3164381761

Download Submit
memory/856-138-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/856-155-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/856-140-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/856-145-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/856-165-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/856-164-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3392-132-0x00007FFFC84A0000-0x00007FFFC8ED6000-memory.dmp

Filesize
10.2MB

Download
memory/4908-136-0x00007FFFC84A0000-0x00007FFFC8ED6000-memory.dmp

Filesize
10.2MB

Download
memory/5088-154-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5088-153-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5088-152-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5088-149-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5112-158-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/5112-161-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/5112-162-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/5112-163-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download