isrstealer | 18374c67d37448e2a979d254c295f81173a493b4e0fd5eb3c80a3f6858271d12

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
07-01-2025 03:57

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General

Target

JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe
Size

1.3MB
MD5

4c31ea31113e35d75360f31d5677527f
SHA1

117ec44890f540618a6a2aa3a8018a9231091b84
SHA256

18374c67d37448e2a979d254c295f81173a493b4e0fd5eb3c80a3f6858271d12
SHA512

dd38cd897677f2290724227b045cd384643d952b55c790708e718c1fed1ecee897b1f8a4cbf6309c2eaecd9e059157795a2028715514df5e6e8962378e800e21
SSDEEP

24576:DNR2zaQBt37/CZ0w1PeWnzqhqCC6+PEI+J36U+r3fUA6wKkS:iUsrC6aEfJmLzKL

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
behavioral1/memory/2872-8-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/2872-4-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/2872-31-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/2872-32-0x0000000000400000-0x0000000000442000-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
behavioral1/memory/2676-28-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/2676-30-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/2676-28-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/2676-30-0x0000000000400000-0x000000000041F000-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-1-5-21-2039016743-699959520-214465309-1000\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-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\EiiHmCimBjikoXYp = "C:\\Users\\Admin\\AppData\\Local\\Temp\\JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe"	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1600 set thread context of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 2872 set thread context of 2808	2872	RegAsm.exe	31
PID 2872 set thread context of 2676	2872	RegAsm.exe	32

UPX packed file 12 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2808-17-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2808-15-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2808-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2808-19-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2808-18-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2808-21-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2676-23-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2676-25-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2676-27-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2676-29-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2676-28-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2676-30-0x0000000000400000-0x000000000041F000-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_4c31ea31113e35d75360f31d5677527f.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
2872	RegAsm.exe

Suspicious use of WriteProcessMemory 35 IoCs

description	pid	Process	procid_target
PID 1600 wrote to memory of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 1600 wrote to memory of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 1600 wrote to memory of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 1600 wrote to memory of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 1600 wrote to memory of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 1600 wrote to memory of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 1600 wrote to memory of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 1600 wrote to memory of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 1600 wrote to memory of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 1600 wrote to memory of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 1600 wrote to memory of 2872	1600	JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe	30
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2808	2872	RegAsm.exe	31
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32
PID 2872 wrote to memory of 2676	2872	RegAsm.exe	32

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_4c31ea31113e35d75360f31d5677527f.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1600
- 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:2872
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\W002XEkpJb.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2808
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\WE6SiSLIqS.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:2676

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\W002XEkpJb.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/2676-30-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2676-28-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2676-29-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2676-27-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2676-25-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2676-23-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2808-17-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2808-19-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2808-18-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2808-21-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2808-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2808-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2872-8-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2872-0-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2872-2-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2872-4-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2872-6-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2872-31-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2872-32-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads