isrstealer | b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd

General

Target

b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe
Size

324KB
MD5

58e797d97c447770b6b9d85e70cf9aca
SHA1

ca425a27dd9f7edd66f579c871b3d1ff49efaa73
SHA256

b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd
SHA512

a26820aa51e157da5ee51e54e564f8f4c46c8e5610da3807f2038a2d830d56f36d02e9002cb7dca291dba99fd10b42afc137f7e1e23712ac4336a50c4e403edc
SSDEEP

6144:yoY7yvft3kh+vIjazquDf02UebwfYSD3+AyqvGTX4ULqgqCRqWSc7:yo5vf6PEqC0ObeND3+AyC6GgbKs

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/804-134-0x0000000000000000-mapping.dmp	family_isrstealer
behavioral2/memory/804-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/804-140-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/804-153-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/804-154-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4380-151-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4380-152-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/4380-151-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4380-152-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1536-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1536-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1536-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1536-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4380-148-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4380-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4380-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4380-152-0x0000000000400000-0x000000000041F000-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-1-5-21-929662420-1054238289-2961194603-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3704 set thread context of 804	3704	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	82
PID 804 set thread context of 1536	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	83
PID 804 set thread context of 4380	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	84

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3704	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe
804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 3704 wrote to memory of 804	3704	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	82
PID 3704 wrote to memory of 804	3704	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	82
PID 3704 wrote to memory of 804	3704	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	82
PID 3704 wrote to memory of 804	3704	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	82
PID 3704 wrote to memory of 804	3704	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	82
PID 3704 wrote to memory of 804	3704	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	82
PID 3704 wrote to memory of 804	3704	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	82
PID 3704 wrote to memory of 804	3704	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	82
PID 804 wrote to memory of 1536	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	83
PID 804 wrote to memory of 1536	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	83
PID 804 wrote to memory of 1536	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	83
PID 804 wrote to memory of 1536	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	83
PID 804 wrote to memory of 1536	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	83
PID 804 wrote to memory of 1536	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	83
PID 804 wrote to memory of 1536	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	83
PID 804 wrote to memory of 1536	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	83
PID 804 wrote to memory of 4380	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	84
PID 804 wrote to memory of 4380	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	84
PID 804 wrote to memory of 4380	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	84
PID 804 wrote to memory of 4380	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	84
PID 804 wrote to memory of 4380	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	84
PID 804 wrote to memory of 4380	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	84
PID 804 wrote to memory of 4380	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	84
PID 804 wrote to memory of 4380	804	b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe	84

C:\Users\Admin\AppData\Local\Temp\b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe
"C:\Users\Admin\AppData\Local\Temp\b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3704
- C:\Users\Admin\AppData\Local\Temp\b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe
  "C:\Users\Admin\AppData\Local\Temp\b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:804
- - C:\Users\Admin\AppData\Local\Temp\b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\DTn0b6qO5r.ini"
    3⤵
    PID:1536
- - C:\Users\Admin\AppData\Local\Temp\b1b5634d82b54f236ec950694065a46c7f3f7d381d747d9ef67cfff6db1de9bd.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\E2y2VU3pG5.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:4380

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\DTn0b6qO5r.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/804-140-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/804-153-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/804-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/804-154-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1536-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1536-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1536-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1536-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4380-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4380-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4380-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4380-148-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

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