isrstealer | 1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521

General

Target

1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe
Size

744KB
MD5

315e68bc527fb503eec6aa8e48c3169d
SHA1

daf000b5d8f439639725716c233d32c46c032e78
SHA256

1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521
SHA512

c36996e8783013700cf2c27b243b0ee11b17de3b9e446ef07f066ab1820516ae06329d9a5c0f932bf98467f74da5d3c467954075f4671e18ff2abb449d8cba3f
SSDEEP

12288:gnhOhR3rE1SlW+Ww/TvIlMxb6+MVzdMJNLF3N0j2tDlrYQD9Q5BI4ebCqS:gER7GSliw/7qMJ6YzF3N0SrrY3fYm

Score

10^/10

isrstealer 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/4080-136-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4080-139-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4080-148-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4080-149-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4408-132-0x0000000000400000-0x0000000000649000-memory.dmp	upx
behavioral2/memory/4408-137-0x0000000000400000-0x0000000000649000-memory.dmp	upx
behavioral2/memory/2784-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2784-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2784-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2784-146-0x0000000000400000-0x0000000000453000-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

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4408 set thread context of 4080	4408	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	79
PID 4080 set thread context of 2784	4080	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	80

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4080	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 4408 wrote to memory of 4080	4408	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	79
PID 4408 wrote to memory of 4080	4408	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	79
PID 4408 wrote to memory of 4080	4408	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	79
PID 4408 wrote to memory of 4080	4408	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	79
PID 4408 wrote to memory of 4080	4408	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	79
PID 4408 wrote to memory of 4080	4408	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	79
PID 4408 wrote to memory of 4080	4408	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	79
PID 4408 wrote to memory of 4080	4408	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	79
PID 4080 wrote to memory of 2784	4080	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	80
PID 4080 wrote to memory of 2784	4080	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	80
PID 4080 wrote to memory of 2784	4080	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	80
PID 4080 wrote to memory of 2784	4080	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	80
PID 4080 wrote to memory of 2784	4080	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	80
PID 4080 wrote to memory of 2784	4080	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	80
PID 4080 wrote to memory of 2784	4080	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	80
PID 4080 wrote to memory of 2784	4080	1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe	80

C:\Users\Admin\AppData\Local\Temp\1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe
"C:\Users\Admin\AppData\Local\Temp\1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4408
- C:\Users\Admin\AppData\Local\Temp\1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe
  "C:\Users\Admin\AppData\Local\Temp\1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4080
- - C:\Users\Admin\AppData\Local\Temp\1d4a28fc6d8fb4c2e738648df5d377d796ab03852a8396b6e6c7cb5267222521.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\91EVdLC8QB.ini"
    3⤵
    PID:2784

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

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\91EVdLC8QB.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/2784-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2784-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2784-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2784-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4080-135-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4080-136-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4080-139-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4080-148-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4080-149-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4408-137-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4408-132-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download

Analysis

Sharing