isrstealer | 8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf

Analysis

max time kernel
152s
max time network
192s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
30-11-2022 20:02

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General

Target

8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe
Size

925KB
MD5

b44ce3373ae42a70e0b05f6c187d63fb
SHA1

a84bf89d410d5de6c36acbc6f18ad7898234961e
SHA256

8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf
SHA512

c71ecef2b1060c8fe91c0864612dbe3a4df1680e5ddd0d0caae944099ab018509a06fb3b1aa3030f47ab33671d3fdda4ac62d0abb72ba08e4508e65cee07679b
SSDEEP

24576:gRmJkcoQricOIQxiZY1iaYbbg0MqCnzOWpLC:VJZoQrbTFZY1iaYbsFni6C

Score

10^/10

isrstealer collection 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 5 IoCs

resource	yara_rule
behavioral2/memory/2608-139-0x0000000000000000-mapping.dmp	family_isrstealer
behavioral2/memory/2608-140-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2608-149-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2608-159-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2608-160-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3460-157-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3460-158-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/3460-157-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3460-158-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3760-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3760-150-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3760-151-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3760-148-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3760-152-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3460-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3460-156-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3460-157-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3460-158-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3760-161-0x0000000000400000-0x0000000000453000-memory.dmp	upx

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-1-5-21-4246620582-653642754-1174164128-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 1432 set thread context of 220	1432	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	82
PID 220 set thread context of 2608	220	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	83
PID 2608 set thread context of 3760	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	84
PID 2608 set thread context of 3460	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.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 2 IoCs

pid	Process
220	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe
2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 1432 wrote to memory of 220	1432	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	82
PID 1432 wrote to memory of 220	1432	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	82
PID 1432 wrote to memory of 220	1432	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	82
PID 1432 wrote to memory of 220	1432	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	82
PID 1432 wrote to memory of 220	1432	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	82
PID 220 wrote to memory of 2608	220	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	83
PID 220 wrote to memory of 2608	220	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	83
PID 220 wrote to memory of 2608	220	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	83
PID 220 wrote to memory of 2608	220	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	83
PID 220 wrote to memory of 2608	220	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	83
PID 220 wrote to memory of 2608	220	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	83
PID 220 wrote to memory of 2608	220	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	83
PID 220 wrote to memory of 2608	220	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	83
PID 2608 wrote to memory of 3760	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	84
PID 2608 wrote to memory of 3760	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	84
PID 2608 wrote to memory of 3760	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	84
PID 2608 wrote to memory of 3760	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	84
PID 2608 wrote to memory of 3760	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	84
PID 2608 wrote to memory of 3760	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	84
PID 2608 wrote to memory of 3760	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	84
PID 2608 wrote to memory of 3760	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	84
PID 2608 wrote to memory of 3460	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	85
PID 2608 wrote to memory of 3460	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	85
PID 2608 wrote to memory of 3460	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	85
PID 2608 wrote to memory of 3460	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	85
PID 2608 wrote to memory of 3460	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	85
PID 2608 wrote to memory of 3460	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	85
PID 2608 wrote to memory of 3460	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	85
PID 2608 wrote to memory of 3460	2608	8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe	85

C:\Users\Admin\AppData\Local\Temp\8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe
"C:\Users\Admin\AppData\Local\Temp\8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1432
- C:\Users\Admin\AppData\Local\Temp\8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe
  "C:\Users\Admin\AppData\Local\Temp\8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:220
- - C:\Users\Admin\AppData\Local\Temp\8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2608
  - - C:\Users\Admin\AppData\Local\Temp\8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\pr421ItL1l.ini"
      4⤵
      PID:3760
  - - C:\Users\Admin\AppData\Local\Temp\8b5a7090e81e9daa36d8fd8014584ea4f25e9c9b82c9114707c15c1c14114bdf.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\MvT3sAe3Vf.ini"
      4⤵
      Accesses Microsoft Outlook accounts
      PID:3460

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/220-142-0x0000000000400000-0x0000000000405000-memory.dmp

Filesize
20KB

Download
memory/220-135-0x0000000000400000-0x0000000000405000-memory.dmp

Filesize
20KB

Download
memory/2608-160-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2608-140-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2608-159-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2608-149-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3460-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3460-158-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3460-157-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3460-156-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3760-152-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3760-148-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3760-151-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3760-150-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3760-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3760-161-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download