isrstealer | f523c4ef34854da34a4dd80ffe9019b856b5343d59ab4039df9505fb73f747d5

General

Target

JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe
Size

260KB
MD5

7bddbb6e8ef452ccfae39772e1e65611
SHA1

9be5b0d96f4a8bfe0e64e4f05e3ce2ed9eebc6c7
SHA256

f523c4ef34854da34a4dd80ffe9019b856b5343d59ab4039df9505fb73f747d5
SHA512

2d981618b7c3011d594b9e315107f3ad209932d613ed9aa120c96cad99bf34bfc4404ddf9c2230ac3d8247c151ffe9f4846de2e7fc15d5d1514bf8ebf405efb6
SSDEEP

6144:vYb//1PxwMdIKCC0ef//uXltKc+LVsz9b8R4jvLXou:FMdFeCXuLKcCVsz6SDLXo

Score

10^/10

isrstealer collection discovery 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
Isrstealer family
isrstealer

Detected Nirsoft tools 3 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral2/memory/3788-15-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3788-16-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3788-17-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3788-15-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3788-16-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3788-17-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3576 set thread context of 1888	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	83
PID 3576 set thread context of 3788	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	86

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1888-2-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1888-4-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1888-5-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1888-6-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1888-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3788-12-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3788-14-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3788-15-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3788-16-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3788-17-0x0000000000400000-0x000000000041F000-memory.dmp	upx

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 3576 wrote to memory of 1888	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	83
PID 3576 wrote to memory of 1888	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	83
PID 3576 wrote to memory of 1888	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	83
PID 3576 wrote to memory of 1888	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	83
PID 3576 wrote to memory of 1888	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	83
PID 3576 wrote to memory of 1888	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	83
PID 3576 wrote to memory of 1888	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	83
PID 3576 wrote to memory of 1888	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	83
PID 3576 wrote to memory of 3788	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	86
PID 3576 wrote to memory of 3788	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	86
PID 3576 wrote to memory of 3788	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	86
PID 3576 wrote to memory of 3788	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	86
PID 3576 wrote to memory of 3788	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	86
PID 3576 wrote to memory of 3788	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	86
PID 3576 wrote to memory of 3788	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	86
PID 3576 wrote to memory of 3788	3576	JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe	86

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3576
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe
  /scomma "C:\Users\Admin\AppData\Local\Temp\nDFjC2wRyC.ini"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1888
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7bddbb6e8ef452ccfae39772e1e65611.exe
  /scomma "C:\Users\Admin\AppData\Local\Temp\nvf1MTOswe.ini"
  2⤵
  - Accesses Microsoft Outlook accounts
  - System Location Discovery: System Language Discovery
  PID:3788

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nDFjC2wRyC.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1888-2-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1888-4-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1888-5-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1888-6-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1888-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3788-12-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3788-14-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3788-15-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3788-16-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3788-17-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

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