isrstealer | ff07b7b692ac8f2f764ffa76b626e646d33b5246eb3ee0868c27e53e0eac6ce9

General

Target

JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe
Size

431KB
MD5

6fe5e5ed34eaff9d0777badc70951d20
SHA1

bb9c7a5f721c2f2819e3ec5520f4233df37ed81e
SHA256

ff07b7b692ac8f2f764ffa76b626e646d33b5246eb3ee0868c27e53e0eac6ce9
SHA512

f33d619f6f4a61cc8546bbfbdbf3898958e2f6ea7141c444ef6b75f68ac58b962b390d2b64bd67941a8941d0261b644069ec67423e7418f033dfbfee38943237
SSDEEP

6144:r+jUYHK3zAORzl+XarvxFUY53WVT0VxRjFknT8L8WOAaEmKGhEhsXwipMAaR4i+Q:r+jXKjDzsGfpVzeTibGEyXwipMF4i+Q

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
behavioral1/memory/1728-5-0x0000000000400000-0x0000000005C56000-memory.dmp	family_isrstealer
behavioral1/memory/1728-11-0x0000000000400000-0x0000000005C56000-memory.dmp	family_isrstealer
behavioral1/memory/1728-18-0x0000000000400000-0x0000000005C56000-memory.dmp	family_isrstealer
behavioral1/memory/1728-19-0x0000000000400000-0x0000000005C56000-memory.dmp	family_isrstealer

Isrstealer family
isrstealer

Detected Nirsoft tools 2 IoCs

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

resource	yara_rule
behavioral1/memory/2712-17-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/2712-14-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/2712-17-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/2712-14-0x0000000000400000-0x000000000041F000-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-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1728 set thread context of 2676	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	30
PID 1728 set thread context of 2712	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	32

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2676-4-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2676-3-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2676-2-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2676-6-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2676-8-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2712-17-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2712-14-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2712-13-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2712-12-0x0000000000400000-0x000000000041F000-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_6fe5e5ed34eaff9d0777badc70951d20.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1728 wrote to memory of 2676	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	30
PID 1728 wrote to memory of 2676	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	30
PID 1728 wrote to memory of 2676	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	30
PID 1728 wrote to memory of 2676	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	30
PID 1728 wrote to memory of 2676	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	30
PID 1728 wrote to memory of 2676	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	30
PID 1728 wrote to memory of 2676	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	30
PID 1728 wrote to memory of 2676	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	30
PID 1728 wrote to memory of 2676	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	30
PID 1728 wrote to memory of 2712	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	32
PID 1728 wrote to memory of 2712	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	32
PID 1728 wrote to memory of 2712	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	32
PID 1728 wrote to memory of 2712	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	32
PID 1728 wrote to memory of 2712	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	32
PID 1728 wrote to memory of 2712	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	32
PID 1728 wrote to memory of 2712	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	32
PID 1728 wrote to memory of 2712	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	32
PID 1728 wrote to memory of 2712	1728	JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe	32

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1728
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe
  /scomma "C:\Users\Admin\AppData\Local\Temp\FuzvJV9yq6.ini"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2676
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6fe5e5ed34eaff9d0777badc70951d20.exe
  /scomma "C:\Users\Admin\AppData\Local\Temp\GUx73QWU4F.ini"
  2⤵
  - Accesses Microsoft Outlook accounts
  - System Location Discovery: System Language Discovery
  PID:2712

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\FuzvJV9yq6.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1728-5-0x0000000000400000-0x0000000005C56000-memory.dmp

Filesize
88.3MB

Download
memory/1728-11-0x0000000000400000-0x0000000005C56000-memory.dmp

Filesize
88.3MB

Download
memory/1728-18-0x0000000000400000-0x0000000005C56000-memory.dmp

Filesize
88.3MB

Download
memory/1728-19-0x0000000000400000-0x0000000005C56000-memory.dmp

Filesize
88.3MB

Download
memory/2676-2-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2676-4-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2676-6-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2676-8-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2676-3-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2712-17-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2712-14-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2712-13-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2712-12-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

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