isrstealer | 7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf

General

Target

7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe
Size

1.4MB
MD5

ff751a7373a480c50c28b39b6b3829cc
SHA1

2703ae455080f51330afabfc82a31b72f7e9bb8d
SHA256

7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf
SHA512

a9a18352f98f14d0a78b571b301872e1abcf0d7dd952cf19caa5b084cf110ddcdc98d92ee1c8920894f084973b6aa5cc994f786caf5850165de9c0af4ded9293
SSDEEP

24576:aRmJkcoQricOIQxiZY1iaGqaEd/PSntrdDoXBwm:/JZoQrbTFZY1iaGXElPGBDoXBwm

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 3 IoCs

resource	yara_rule
behavioral2/memory/1500-136-0x0000000000400000-0x000000000043B000-memory.dmp	family_isrstealer
behavioral2/memory/1500-145-0x0000000000400000-0x000000000043B000-memory.dmp	family_isrstealer
behavioral2/memory/1500-147-0x0000000000400000-0x000000000043B000-memory.dmp	family_isrstealer

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1500-133-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/1500-135-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/1500-136-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/4920-140-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4920-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4920-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4920-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1500-145-0x0000000000400000-0x000000000043B000-memory.dmp	upx
behavioral2/memory/1500-147-0x0000000000400000-0x000000000043B000-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 4872 set thread context of 1500	4872	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	81
PID 1500 set thread context of 4920	1500	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.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
1500	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 4872 wrote to memory of 1500	4872	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	81
PID 4872 wrote to memory of 1500	4872	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	81
PID 4872 wrote to memory of 1500	4872	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	81
PID 4872 wrote to memory of 1500	4872	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	81
PID 4872 wrote to memory of 1500	4872	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	81
PID 4872 wrote to memory of 1500	4872	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	81
PID 4872 wrote to memory of 1500	4872	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	81
PID 4872 wrote to memory of 1500	4872	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	81
PID 1500 wrote to memory of 4920	1500	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	82
PID 1500 wrote to memory of 4920	1500	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	82
PID 1500 wrote to memory of 4920	1500	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	82
PID 1500 wrote to memory of 4920	1500	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	82
PID 1500 wrote to memory of 4920	1500	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	82
PID 1500 wrote to memory of 4920	1500	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	82
PID 1500 wrote to memory of 4920	1500	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	82
PID 1500 wrote to memory of 4920	1500	7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe	82

C:\Users\Admin\AppData\Local\Temp\7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe
"C:\Users\Admin\AppData\Local\Temp\7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4872
- C:\Users\Admin\AppData\Local\Temp\7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe
  "C:\Users\Admin\AppData\Local\Temp\7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1500
- - C:\Users\Admin\AppData\Local\Temp\7f1649e79f84cf1f80aeb723f8f87ddb737da930d7a82e3f0339828293e87baf.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\mUemG44HgI.ini"
    3⤵
    PID:4920

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

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\mUemG44HgI.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1500-133-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/1500-135-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/1500-136-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/1500-145-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/1500-147-0x0000000000400000-0x000000000043B000-memory.dmp

Filesize
236KB

Download
memory/4920-140-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4920-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4920-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4920-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

Sharing