isrstealer | ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135

General

Target

ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe
Size

292KB
MD5

46f72a9792eed693a7d4516e8b726f55
SHA1

05c6265aeb56ff9900963189e04735d0ff52ba80
SHA256

ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135
SHA512

bf1f20aa401979b04c306036b0c73280bcfc13981723284679597cf26e74c0dd0158a498377a50bf694eab4c2ca96fd06780f76b5febe38af88d22d6c6e4e6d0
SSDEEP

6144:IHVtad+e62517rYpuvyjtin+x1VIs+SupvgVRnSBR9DICTxRgDKNzM:Y8d+eZ7rYpuvyjt9mscpkRnSBRm5K9

Score

10^/10

isrstealer persistence 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/4936-133-0x0000000000400000-0x0000000000436000-memory.dmp	family_isrstealer
behavioral2/memory/4936-146-0x0000000000400000-0x0000000000436000-memory.dmp	family_isrstealer
behavioral2/memory/4936-151-0x0000000000400000-0x0000000000436000-memory.dmp	family_isrstealer

Executes dropped EXE 2 IoCs

pid	Process
4936	cvtres.exe
1492	cvtres.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1492-140-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1492-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1492-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1492-147-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1492-148-0x0000000000400000-0x0000000000453000-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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Live = "C:\\Users\\Admin\\AppData\\Local\\Temp\\ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe"	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4960 set thread context of 4936	4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe	83
PID 4936 set thread context of 1492	4936	cvtres.exe	84

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe
4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe
Token: SeDebugPrivilege	4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4936	cvtres.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 4960 wrote to memory of 4936	4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe	83
PID 4960 wrote to memory of 4936	4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe	83
PID 4960 wrote to memory of 4936	4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe	83
PID 4960 wrote to memory of 4936	4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe	83
PID 4960 wrote to memory of 4936	4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe	83
PID 4960 wrote to memory of 4936	4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe	83
PID 4960 wrote to memory of 4936	4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe	83
PID 4960 wrote to memory of 4936	4960	ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe	83
PID 4936 wrote to memory of 1492	4936	cvtres.exe	84
PID 4936 wrote to memory of 1492	4936	cvtres.exe	84
PID 4936 wrote to memory of 1492	4936	cvtres.exe	84
PID 4936 wrote to memory of 1492	4936	cvtres.exe	84
PID 4936 wrote to memory of 1492	4936	cvtres.exe	84
PID 4936 wrote to memory of 1492	4936	cvtres.exe	84
PID 4936 wrote to memory of 1492	4936	cvtres.exe	84
PID 4936 wrote to memory of 1492	4936	cvtres.exe	84

C:\Users\Admin\AppData\Local\Temp\ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe
"C:\Users\Admin\AppData\Local\Temp\ed9aa84319abed34e632722d0c483a31195e103f21ddfec4423a5b0c4fd89135.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4960
- C:\Users\Admin\AppData\Local\Temp\cvtres.exe
  C:\Users\Admin\AppData\Local\Temp\\cvtres.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4936
- - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\J5MCNfVIlk.ini"
    3⤵
    - Executes dropped EXE
    PID:1492

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

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\J5MCNfVIlk.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
memory/1492-148-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1492-140-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1492-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1492-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1492-147-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4936-146-0x0000000000400000-0x0000000000436000-memory.dmp

Filesize
216KB

Download
memory/4936-133-0x0000000000400000-0x0000000000436000-memory.dmp

Filesize
216KB

Download
memory/4936-151-0x0000000000400000-0x0000000000436000-memory.dmp

Filesize
216KB

Download
memory/4960-144-0x0000000074AC0000-0x0000000075071000-memory.dmp

Filesize
5.7MB

Download
memory/4960-149-0x0000000074AC0000-0x0000000075071000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing