isrstealer | 4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b

General

Target

4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe
Size

955KB
MD5

53577d9b7eedf7135a1dfcec08af74f1
SHA1

8c2b67354d3a08b21e08c4babaa4c682a6307d09
SHA256

4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b
SHA512

a207bd289a22a83c5d1b6f750b220f3ae88f92d2ddf4c66ddd29c2957498f1c43aa8b8827e8cf95db4e3e156ff1dc910bfc581d6d8a1808602cffc2f3a61f504
SSDEEP

24576:8RmJkcoQricOIQxiZY1iaYzKo4rULiy+LHevBVSAgkQE:pJZoQrbTFZY1iaYz1ULqEFE

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/5024-136-0x0000000000400000-0x0000000000448000-memory.dmp	family_isrstealer
behavioral2/memory/5024-145-0x0000000000400000-0x0000000000448000-memory.dmp	family_isrstealer
behavioral2/memory/5024-153-0x0000000000400000-0x0000000000448000-memory.dmp	family_isrstealer
behavioral2/memory/5024-154-0x0000000000400000-0x0000000000448000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/1048-151-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1048-152-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/1048-151-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1048-152-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 14 IoCs

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

upx

resource	yara_rule
behavioral2/memory/5024-133-0x0000000000400000-0x0000000000448000-memory.dmp	upx
behavioral2/memory/5024-135-0x0000000000400000-0x0000000000448000-memory.dmp	upx
behavioral2/memory/5024-136-0x0000000000400000-0x0000000000448000-memory.dmp	upx
behavioral2/memory/2432-140-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2432-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2432-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2432-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5024-145-0x0000000000400000-0x0000000000448000-memory.dmp	upx
behavioral2/memory/1048-148-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1048-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1048-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1048-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/5024-153-0x0000000000400000-0x0000000000448000-memory.dmp	upx
behavioral2/memory/5024-154-0x0000000000400000-0x0000000000448000-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-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4056 set thread context of 5024	4056	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	79
PID 5024 set thread context of 2432	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	81
PID 5024 set thread context of 1048	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	82

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
5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4056 wrote to memory of 5024	4056	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	79
PID 4056 wrote to memory of 5024	4056	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	79
PID 4056 wrote to memory of 5024	4056	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	79
PID 4056 wrote to memory of 5024	4056	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	79
PID 4056 wrote to memory of 5024	4056	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	79
PID 4056 wrote to memory of 5024	4056	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	79
PID 4056 wrote to memory of 5024	4056	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	79
PID 4056 wrote to memory of 5024	4056	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	79
PID 5024 wrote to memory of 2432	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	81
PID 5024 wrote to memory of 2432	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	81
PID 5024 wrote to memory of 2432	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	81
PID 5024 wrote to memory of 2432	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	81
PID 5024 wrote to memory of 2432	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	81
PID 5024 wrote to memory of 2432	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	81
PID 5024 wrote to memory of 2432	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	81
PID 5024 wrote to memory of 2432	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	81
PID 5024 wrote to memory of 1048	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	82
PID 5024 wrote to memory of 1048	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	82
PID 5024 wrote to memory of 1048	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	82
PID 5024 wrote to memory of 1048	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	82
PID 5024 wrote to memory of 1048	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	82
PID 5024 wrote to memory of 1048	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	82
PID 5024 wrote to memory of 1048	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	82
PID 5024 wrote to memory of 1048	5024	4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe	82

C:\Users\Admin\AppData\Local\Temp\4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe
"C:\Users\Admin\AppData\Local\Temp\4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4056
- C:\Users\Admin\AppData\Local\Temp\4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe
  "C:\Users\Admin\AppData\Local\Temp\4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5024
- - C:\Users\Admin\AppData\Local\Temp\4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\Vg1k7NbHvu.ini"
    3⤵
    PID:2432
- - C:\Users\Admin\AppData\Local\Temp\4366f72681a05bae5e0b3677d052695bcabcd6a004ccc5c85dc6e94e20f2659b.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\t23cAGW0sk.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1048

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

1

T1082

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\Vg1k7NbHvu.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1048-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1048-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1048-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1048-148-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2432-140-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2432-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2432-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2432-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5024-145-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/5024-136-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/5024-135-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/5024-133-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/5024-153-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/5024-154-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download

Analysis

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