isrstealer | 7815ea5f8a696cf2984b02f058c699a3682f9f3aebeb27486e9428194685c3c6

General

Target

f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe
Size

487KB
MD5

f61be28bb9b68fecb9551495188f9434
SHA1

391d3a38ab1b47605fd9b2e654ba9990e87aa940
SHA256

7815ea5f8a696cf2984b02f058c699a3682f9f3aebeb27486e9428194685c3c6
SHA512

e581ad123207f84eabf4c93f5bffe7e32c904c90c5f5cc0c3179959af604b9482441842e698b671a0fbbab02b99ef1674c9efef0631b3e0e720c5342c8d56b5e
SSDEEP

12288:mNdxlP1UwhjBt8dgOvtdothTheJLyTWOpHOHahuFXHGjZB:mNdxvz2SOboth0hyTXO6hwKL

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

ISR Stealer payload 4 IoCs

resource	yara_rule
behavioral2/memory/4780-5-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4780-10-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4780-30-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4780-37-0x0000000000400000-0x0000000000442000-memory.dmp	family_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/4788-31-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4788-29-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4788-33-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4788-31-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4788-29-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4788-33-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Executes dropped EXE 3 IoCs

pid	Process
4780	vbc.exe
1148	vbc.exe
4788	vbc.exe

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
Uses the VBS compiler for execution 1 TTPs

Command and Scripting Interpreter
T1059

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4972 set thread context of 4780	4972	f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe	82
PID 4780 set thread context of 1148	4780	vbc.exe	83
PID 4780 set thread context of 4788	4780	vbc.exe	89

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1148-14-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1148-17-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1148-18-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1148-19-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1148-23-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4788-25-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4788-28-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4788-31-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4788-29-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4788-33-0x0000000000400000-0x000000000041F000-memory.dmp	upx

System Location Discovery: System Language Discovery 1 TTPs 4 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	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4780	vbc.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4972 wrote to memory of 4780	4972	f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe	82
PID 4972 wrote to memory of 4780	4972	f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe	82
PID 4972 wrote to memory of 4780	4972	f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe	82
PID 4972 wrote to memory of 4780	4972	f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe	82
PID 4972 wrote to memory of 4780	4972	f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe	82
PID 4972 wrote to memory of 4780	4972	f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe	82
PID 4972 wrote to memory of 4780	4972	f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe	82
PID 4972 wrote to memory of 4780	4972	f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe	82
PID 4780 wrote to memory of 1148	4780	vbc.exe	83
PID 4780 wrote to memory of 1148	4780	vbc.exe	83
PID 4780 wrote to memory of 1148	4780	vbc.exe	83
PID 4780 wrote to memory of 1148	4780	vbc.exe	83
PID 4780 wrote to memory of 1148	4780	vbc.exe	83
PID 4780 wrote to memory of 1148	4780	vbc.exe	83
PID 4780 wrote to memory of 1148	4780	vbc.exe	83
PID 4780 wrote to memory of 1148	4780	vbc.exe	83
PID 4780 wrote to memory of 4788	4780	vbc.exe	89
PID 4780 wrote to memory of 4788	4780	vbc.exe	89
PID 4780 wrote to memory of 4788	4780	vbc.exe	89
PID 4780 wrote to memory of 4788	4780	vbc.exe	89
PID 4780 wrote to memory of 4788	4780	vbc.exe	89
PID 4780 wrote to memory of 4788	4780	vbc.exe	89
PID 4780 wrote to memory of 4788	4780	vbc.exe	89
PID 4780 wrote to memory of 4788	4780	vbc.exe	89

C:\Users\Admin\AppData\Local\Temp\f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\f61be28bb9b68fecb9551495188f9434_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4972
- C:\Users\Admin\AppData\Local\Temp\vbc.exe
  C:\Users\Admin\AppData\Local\Temp\vbc.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4780
- - C:\Users\Admin\AppData\Local\Temp\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\K3SuF4KoEJ.ini"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1148
- - C:\Users\Admin\AppData\Local\Temp\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tN5LZMIWt0.ini"
    3⤵
    - Executes dropped EXE
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:4788

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

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\K3SuF4KoEJ.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

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

Filesize
1.1MB

MD5
d881de17aa8f2e2c08cbb7b265f928f9

SHA1
08936aebc87decf0af6e8eada191062b5e65ac2a

SHA256
b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

SHA512
5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

Download Submit
memory/1148-14-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1148-23-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1148-19-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1148-18-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1148-17-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4780-10-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4780-5-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4780-30-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4780-37-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4788-25-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4788-28-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4788-31-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4788-29-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4788-33-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4972-13-0x0000000075580000-0x0000000075B31000-memory.dmp

Filesize
5.7MB

Download
memory/4972-0-0x0000000075582000-0x0000000075583000-memory.dmp

Filesize
4KB

Download
memory/4972-2-0x0000000075580000-0x0000000075B31000-memory.dmp

Filesize
5.7MB

Download
memory/4972-1-0x0000000075580000-0x0000000075B31000-memory.dmp

Filesize
5.7MB

Download

Analysis

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