isrstealer | f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6

General

Target

f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe
Size

304KB
MD5

70593ba12aadb972c6b6b2b024c5158c
SHA1

2d3e5c9cd1d90062d007394903e2448751eb38ba
SHA256

f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6
SHA512

4966300f7ef8183a7ed2e293c559c4e6feba29de5bf8b73265a1a9f29440db99c8b33250af33098673bee47a9b9e3a3eb88efe27c883233c93701287fbe759fb
SSDEEP

6144:QYhfXzkpnfP89l3hz88HSvYYI6KYM7HRw6wCsQytN6LbC2N:QYponfU7BP+YYJKbK1BcLbZN

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 4 IoCs

resource	yara_rule
behavioral2/memory/3204-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3204-143-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3204-148-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3204-155-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/952-153-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/952-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/952-153-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/952-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1052-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1052-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1052-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1052-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/952-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/952-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/952-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/952-154-0x0000000000400000-0x000000000041F000-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-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1852 set thread context of 3204	1852	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	89
PID 3204 set thread context of 1052	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	90
PID 3204 set thread context of 952	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	91

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1852 wrote to memory of 3204	1852	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	89
PID 1852 wrote to memory of 3204	1852	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	89
PID 1852 wrote to memory of 3204	1852	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	89
PID 1852 wrote to memory of 3204	1852	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	89
PID 1852 wrote to memory of 3204	1852	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	89
PID 1852 wrote to memory of 3204	1852	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	89
PID 1852 wrote to memory of 3204	1852	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	89
PID 1852 wrote to memory of 3204	1852	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	89
PID 3204 wrote to memory of 1052	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	90
PID 3204 wrote to memory of 1052	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	90
PID 3204 wrote to memory of 1052	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	90
PID 3204 wrote to memory of 1052	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	90
PID 3204 wrote to memory of 1052	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	90
PID 3204 wrote to memory of 1052	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	90
PID 3204 wrote to memory of 1052	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	90
PID 3204 wrote to memory of 1052	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	90
PID 3204 wrote to memory of 952	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	91
PID 3204 wrote to memory of 952	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	91
PID 3204 wrote to memory of 952	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	91
PID 3204 wrote to memory of 952	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	91
PID 3204 wrote to memory of 952	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	91
PID 3204 wrote to memory of 952	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	91
PID 3204 wrote to memory of 952	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	91
PID 3204 wrote to memory of 952	3204	f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe	91

C:\Users\Admin\AppData\Local\Temp\f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe
"C:\Users\Admin\AppData\Local\Temp\f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1852
- C:\Users\Admin\AppData\Local\Temp\f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe
  "C:\Users\Admin\AppData\Local\Temp\f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3204
- - C:\Users\Admin\AppData\Local\Temp\f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\XFMnmm9S0r.ini"
    3⤵
    PID:1052
- - C:\Users\Admin\AppData\Local\Temp\f1f5a8399efdf4dd727b63369c5342604c257b591cd5683b33be1ad2f88132a6.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\lFvTF4qkX5.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:952

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\XFMnmm9S0r.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/952-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/952-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/952-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/952-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1052-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1052-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1052-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1052-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1852-138-0x0000000074660000-0x0000000074C11000-memory.dmp

Filesize
5.7MB

Download
memory/1852-132-0x0000000074660000-0x0000000074C11000-memory.dmp

Filesize
5.7MB

Download
memory/1852-133-0x0000000074660000-0x0000000074C11000-memory.dmp

Filesize
5.7MB

Download
memory/3204-148-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3204-143-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3204-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3204-155-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

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