isrstealer | 237a93b6f64c1f79a1599610f3e8566d903557199a0a0d2298265d12fb9d69eb

General

Target

237a93b6f64c1f79a1599610f3e8566d903557199a0a0d2298265d12fb9d69eb.exe
Size

4.3MB
MD5

3e2c8e82a903d590ec1e77da118ba422
SHA1

048f4fcb2f67cd5e530834e9517401fac4716fe7
SHA256

237a93b6f64c1f79a1599610f3e8566d903557199a0a0d2298265d12fb9d69eb
SHA512

e50cd2d0c34a2b742a3f6d5911a83263c4d1378149ca956011a64ae0c326ed06b6300ddcd74525ed64f9e893a41fd78c61ed091fdc6cec1da422615a2893bb68
SSDEEP

98304:TrOUtpIu0ahhViYC/+tpfX7L320/DJ55qbZ8miDtAdh8tS5:Xntmu04riYA+tpjLb15PmiDtih8tS

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 4 IoCs

resource	yara_rule
behavioral2/memory/4732-138-0x0000000000000000-mapping.dmp	family_isrstealer
behavioral2/memory/4732-139-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4732-151-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4732-153-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Executes dropped EXE 3 IoCs

pid	Process
3000	google.exe
4732	google.exe
4148	google.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4148-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4148-148-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4148-149-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4148-150-0x0000000000400000-0x0000000000453000-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 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce	237a93b6f64c1f79a1599610f3e8566d903557199a0a0d2298265d12fb9d69eb.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup0 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP000.TMP\\\""	237a93b6f64c1f79a1599610f3e8566d903557199a0a0d2298265d12fb9d69eb.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3000 set thread context of 4732	3000	google.exe	85
PID 4732 set thread context of 4148	4732	google.exe	86

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3000	google.exe
4732	google.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 3856 wrote to memory of 3000	3856	237a93b6f64c1f79a1599610f3e8566d903557199a0a0d2298265d12fb9d69eb.exe	82
PID 3856 wrote to memory of 3000	3856	237a93b6f64c1f79a1599610f3e8566d903557199a0a0d2298265d12fb9d69eb.exe	82
PID 3856 wrote to memory of 3000	3856	237a93b6f64c1f79a1599610f3e8566d903557199a0a0d2298265d12fb9d69eb.exe	82
PID 3000 wrote to memory of 4732	3000	google.exe	85
PID 3000 wrote to memory of 4732	3000	google.exe	85
PID 3000 wrote to memory of 4732	3000	google.exe	85
PID 3000 wrote to memory of 4732	3000	google.exe	85
PID 3000 wrote to memory of 4732	3000	google.exe	85
PID 3000 wrote to memory of 4732	3000	google.exe	85
PID 3000 wrote to memory of 4732	3000	google.exe	85
PID 4732 wrote to memory of 4148	4732	google.exe	86
PID 4732 wrote to memory of 4148	4732	google.exe	86
PID 4732 wrote to memory of 4148	4732	google.exe	86
PID 4732 wrote to memory of 4148	4732	google.exe	86
PID 4732 wrote to memory of 4148	4732	google.exe	86
PID 4732 wrote to memory of 4148	4732	google.exe	86
PID 4732 wrote to memory of 4148	4732	google.exe	86
PID 4732 wrote to memory of 4148	4732	google.exe	86

C:\Users\Admin\AppData\Local\Temp\237a93b6f64c1f79a1599610f3e8566d903557199a0a0d2298265d12fb9d69eb.exe
"C:\Users\Admin\AppData\Local\Temp\237a93b6f64c1f79a1599610f3e8566d903557199a0a0d2298265d12fb9d69eb.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:3856
- C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\google.exe
  C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\google.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3000
- - C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\google.exe
    "C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\google.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4732
  - - C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\google.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\9AHuoiJ5f7.ini"
      4⤵
      Executes dropped EXE
      PID:4148

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\9AHuoiJ5f7.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\google.exe

Filesize
269KB

MD5
cf81a92e9d22b86c40785709c9a251ef

SHA1
6b0556590028b335ac2c8fbea0f6fdfb61a49554

SHA256
c42f748a30b837e62a59d5c8d8e462929070a4eca4e9f0ffac452ed3d1fd59b4

SHA512
b68f020f2e52e43a2007e447314638914f55bc27f21ced0dcf8be99bfe33538020fb1b7eb1a3a6148e357392913f8ab917e8f7debcf53866dfb014fd26871eff

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\google.exe

Filesize
269KB

MD5
cf81a92e9d22b86c40785709c9a251ef

SHA1
6b0556590028b335ac2c8fbea0f6fdfb61a49554

SHA256
c42f748a30b837e62a59d5c8d8e462929070a4eca4e9f0ffac452ed3d1fd59b4

SHA512
b68f020f2e52e43a2007e447314638914f55bc27f21ced0dcf8be99bfe33538020fb1b7eb1a3a6148e357392913f8ab917e8f7debcf53866dfb014fd26871eff

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\google.exe

Filesize
269KB

MD5
cf81a92e9d22b86c40785709c9a251ef

SHA1
6b0556590028b335ac2c8fbea0f6fdfb61a49554

SHA256
c42f748a30b837e62a59d5c8d8e462929070a4eca4e9f0ffac452ed3d1fd59b4

SHA512
b68f020f2e52e43a2007e447314638914f55bc27f21ced0dcf8be99bfe33538020fb1b7eb1a3a6148e357392913f8ab917e8f7debcf53866dfb014fd26871eff

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\google.exe

Filesize
269KB

MD5
cf81a92e9d22b86c40785709c9a251ef

SHA1
6b0556590028b335ac2c8fbea0f6fdfb61a49554

SHA256
c42f748a30b837e62a59d5c8d8e462929070a4eca4e9f0ffac452ed3d1fd59b4

SHA512
b68f020f2e52e43a2007e447314638914f55bc27f21ced0dcf8be99bfe33538020fb1b7eb1a3a6148e357392913f8ab917e8f7debcf53866dfb014fd26871eff

Download Submit
memory/3000-137-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4148-150-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4148-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4148-148-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4148-149-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4732-139-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4732-151-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4732-153-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download

Analysis

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