isrstealer | bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a

General

Target

bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe
Size

562KB
MD5

d871fa1f2eda016986362b5d3d55ad53
SHA1

d66d8e4b3f77589668471835cfe251aa5b1bf544
SHA256

bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a
SHA512

eeee76a71022eca49046017689c7d02e5f62bfe6dcb75005797d2e8d1c891b812732c71e66564e6a47ed70d7a5ec9db95d55ddb3011a3725a03723aac5e4be33
SSDEEP

12288:K7fi9Y9z8k0GdekXhMfugzCpx7WPqD1041uBs4ivdsjTq:K7eY9zYCeWhMfzOpxaPk04bB

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 1 IoCs

resource	yara_rule
behavioral2/memory/4196-135-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Executes dropped EXE 2 IoCs

pid	Process
4196	notepad .exe
1456	notepad .exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1456-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1456-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1456-147-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1456-148-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1456-149-0x0000000000400000-0x0000000000453000-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 2372 set thread context of 4196	2372	bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe	82
PID 4196 set thread context of 1456	4196	notepad .exe	86

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2372	bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2372	bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4196	notepad .exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 2372 wrote to memory of 4196	2372	bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe	82
PID 2372 wrote to memory of 4196	2372	bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe	82
PID 2372 wrote to memory of 4196	2372	bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe	82
PID 2372 wrote to memory of 4196	2372	bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe	82
PID 2372 wrote to memory of 4196	2372	bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe	82
PID 2372 wrote to memory of 4196	2372	bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe	82
PID 2372 wrote to memory of 4196	2372	bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe	82
PID 2372 wrote to memory of 4196	2372	bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe	82
PID 4196 wrote to memory of 1456	4196	notepad .exe	86
PID 4196 wrote to memory of 1456	4196	notepad .exe	86
PID 4196 wrote to memory of 1456	4196	notepad .exe	86
PID 4196 wrote to memory of 1456	4196	notepad .exe	86
PID 4196 wrote to memory of 1456	4196	notepad .exe	86
PID 4196 wrote to memory of 1456	4196	notepad .exe	86
PID 4196 wrote to memory of 1456	4196	notepad .exe	86
PID 4196 wrote to memory of 1456	4196	notepad .exe	86

C:\Users\Admin\AppData\Local\Temp\bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe
"C:\Users\Admin\AppData\Local\Temp\bf71870b86adb5d0aa6290073c4a21465cded4e612a08a6b9db30dd1a927fe7a.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2372
- C:\Users\Admin\AppData\Local\Temp\notepad .exe
  "C:\Users\Admin\AppData\Local\Temp\notepad .exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4196
- - C:\Users\Admin\AppData\Local\Temp\notepad .exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\nP1EBY2EOd.ini"
    3⤵
    - Executes dropped EXE
    PID:1456

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\nP1EBY2EOd.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\notepad .exe

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
C:\Users\Admin\AppData\Local\Temp\notepad .exe

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
C:\Users\Admin\AppData\Local\Temp\notepad .exe

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
memory/1456-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1456-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1456-147-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1456-148-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1456-149-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2372-132-0x0000000075270000-0x0000000075821000-memory.dmp

Filesize
5.7MB

Download
memory/2372-146-0x0000000075270000-0x0000000075821000-memory.dmp

Filesize
5.7MB

Download
memory/2372-133-0x0000000075270000-0x0000000075821000-memory.dmp

Filesize
5.7MB

Download
memory/4196-135-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download

Analysis

Sharing