isrstealer | 24ea81e04618ce6884bd241fa03f7dea6e8eed01d4c3e3dc2a5fd2410187b60d

General

Target

JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe
Size

1.3MB
MD5

d92a907d735a8937e7fdb7b6163f48be
SHA1

841fdfc69ad20ebb18857449dcd5817d49f49339
SHA256

24ea81e04618ce6884bd241fa03f7dea6e8eed01d4c3e3dc2a5fd2410187b60d
SHA512

9bf995b8699ca3ad1d93dd14648732a955d5dced1172ec3429a310f41300fa4b7de4c6c30808a30d509e2398e993c99782f724cf0419df652bf4829bfaa9105f
SSDEEP

24576:fNR2zaQBt37/CZ0w1PeWnzqhqCC6+PEDwXZV9q5Rem/QWLsiM:mUsrC6aEkVb

Score

10^/10

isrstealer collection discovery 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/3556-0-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3556-2-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3556-21-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3556-22-0x0000000000400000-0x0000000000442000-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
behavioral2/memory/3172-19-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3172-20-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3172-19-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3172-20-0x0000000000400000-0x000000000041F000-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-1-5-21-2878641211-696417878-3864914810-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	RegAsm.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\TzOjPWh3aEG02wmA = "C:\\Users\\Admin\\AppData\\Local\\Temp\\JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe"	JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3416 set thread context of 3556	3416	JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe	86
PID 3556 set thread context of 832	3556	RegAsm.exe	87
PID 3556 set thread context of 3172	3556	RegAsm.exe	91

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/832-5-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/832-7-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/832-9-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/832-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/832-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3172-14-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3172-16-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3172-19-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3172-18-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3172-20-0x0000000000400000-0x000000000041F000-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	JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3556	RegAsm.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 3416 wrote to memory of 3556	3416	JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe	86
PID 3416 wrote to memory of 3556	3416	JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe	86
PID 3416 wrote to memory of 3556	3416	JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe	86
PID 3416 wrote to memory of 3556	3416	JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe	86
PID 3416 wrote to memory of 3556	3416	JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe	86
PID 3416 wrote to memory of 3556	3416	JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe	86
PID 3416 wrote to memory of 3556	3416	JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe	86
PID 3416 wrote to memory of 3556	3416	JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe	86
PID 3556 wrote to memory of 832	3556	RegAsm.exe	87
PID 3556 wrote to memory of 832	3556	RegAsm.exe	87
PID 3556 wrote to memory of 832	3556	RegAsm.exe	87
PID 3556 wrote to memory of 832	3556	RegAsm.exe	87
PID 3556 wrote to memory of 832	3556	RegAsm.exe	87
PID 3556 wrote to memory of 832	3556	RegAsm.exe	87
PID 3556 wrote to memory of 832	3556	RegAsm.exe	87
PID 3556 wrote to memory of 832	3556	RegAsm.exe	87
PID 3556 wrote to memory of 3172	3556	RegAsm.exe	91
PID 3556 wrote to memory of 3172	3556	RegAsm.exe	91
PID 3556 wrote to memory of 3172	3556	RegAsm.exe	91
PID 3556 wrote to memory of 3172	3556	RegAsm.exe	91
PID 3556 wrote to memory of 3172	3556	RegAsm.exe	91
PID 3556 wrote to memory of 3172	3556	RegAsm.exe	91
PID 3556 wrote to memory of 3172	3556	RegAsm.exe	91
PID 3556 wrote to memory of 3172	3556	RegAsm.exe	91

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d92a907d735a8937e7fdb7b6163f48be.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3416
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3556
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\A09BK1jiAW.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:832
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\qjMUCAhmhn.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:3172

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\A09BK1jiAW.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/832-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/832-5-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/832-7-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/832-9-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/832-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3172-14-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3172-16-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3172-19-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3172-18-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3172-20-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3556-2-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3556-0-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3556-21-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3556-22-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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