isrstealer | 4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab

General

Target

4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
Size

260KB
MD5

6bb6057b3d183d8966b50ccbe364b370
SHA1

ea48392d5dcd15f64a2d1cb9108c6141c1aabce3
SHA256

4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab
SHA512

ea0c2ed98a48cdeb35168d108aeebc50108f75ab64e8538cf323ae03e9c900f67995dfe19c1520debc0ef2dadd1468e1cc2aae7bd488f82f5fe58dbd3f8b581d
SSDEEP

6144:gYb//1PxwDdIKCC0ef//uXltKc+LVsz9b8R4jvLXou:wDdFeCXuLKcCVsz6SDLXo

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

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1584-71-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1584-72-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/1584-71-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1584-72-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1628-56-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1628-60-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1628-61-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1628-62-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1628-63-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1584-66-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1584-70-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1584-71-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1584-72-0x0000000000400000-0x000000000041F000-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-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1808 set thread context of 1628	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	28
PID 1808 set thread context of 1584	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	31

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1808 wrote to memory of 1628	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	28
PID 1808 wrote to memory of 1628	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	28
PID 1808 wrote to memory of 1628	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	28
PID 1808 wrote to memory of 1628	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	28
PID 1808 wrote to memory of 1628	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	28
PID 1808 wrote to memory of 1628	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	28
PID 1808 wrote to memory of 1628	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	28
PID 1808 wrote to memory of 1628	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	28
PID 1808 wrote to memory of 1628	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	28
PID 1808 wrote to memory of 1584	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	31
PID 1808 wrote to memory of 1584	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	31
PID 1808 wrote to memory of 1584	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	31
PID 1808 wrote to memory of 1584	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	31
PID 1808 wrote to memory of 1584	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	31
PID 1808 wrote to memory of 1584	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	31
PID 1808 wrote to memory of 1584	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	31
PID 1808 wrote to memory of 1584	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	31
PID 1808 wrote to memory of 1584	1808	4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe	31

C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
"C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1808
- C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
  /scomma "C:\Users\Admin\AppData\Local\Temp\HmSOL9z2pe.ini"
  2⤵
  PID:1628
- C:\Users\Admin\AppData\Local\Temp\4f851094891460acb9aee4b0273dc8f8b1dd760e63233daf93cdb21b57e8f3ab.exe
  /scomma "C:\Users\Admin\AppData\Local\Temp\nCwrp9Cqly.ini"
  2⤵
  - Accesses Microsoft Outlook accounts
  PID:1584

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\HmSOL9z2pe.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1584-72-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1584-71-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1584-70-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1584-66-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1628-60-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1628-63-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1628-62-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1628-61-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1628-56-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1628-59-0x0000000075211000-0x0000000075213000-memory.dmp

Filesize
8KB

Download

Analysis

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