isrstealer | 2f1f52855d71e532c986d86aaeb5753ad4b678b512ef056a8c2260612dccbb82

Analysis

max time kernel
105s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
29/03/2025, 20:21

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General

Target

JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Size

1.9MB
MD5

97c58b8ea171d3f901800e34c69141c3
SHA1

5a1cf7700ee264cface9968ffcd749527ef51992
SHA256

2f1f52855d71e532c986d86aaeb5753ad4b678b512ef056a8c2260612dccbb82
SHA512

13c0dfb88cd0d33cd5af2dc0ada29ae645052beec0d718c43a6cd278d57effa3c8d402455022bc3ed4217c484041da851e9189ebc7c12a252770a940f6c5813e
SSDEEP

49152:VeOYNw8+Cu9ifT5KzyrOTFfoPebTxc4w6SkN:VjtoVKzyrONoPMqkN

Score

10^/10

isrstealer 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 3 IoCs

resource	yara_rule
behavioral2/memory/4576-20-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/4576-23-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/4576-45-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer

Isrstealer family
isrstealer

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.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

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 5256 set thread context of 4576	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	92
PID 4576 set thread context of 4676	4576	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	93

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4676-28-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4676-33-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4676-41-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4676-37-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4676-36-0x0000000000400000-0x0000000000453000-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_97c58b8ea171d3f901800e34c69141c3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe

Modifies registry class 7 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D06818FC-4374-8FAD-76B6-BC3885DF62D8}	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D06818FC-4374-8FAD-76B6-BC3885DF62D8}\ = "Microsoft AVI Files"	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D06818FC-4374-8FAD-76B6-BC3885DF62D8}\AVIFile	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D06818FC-4374-8FAD-76B6-BC3885DF62D8}\AVIFile\ = "7"	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D06818FC-4374-8FAD-76B6-BC3885DF62D8}\InprocServer32	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D06818FC-4374-8FAD-76B6-BC3885DF62D8}\InprocServer32\ = "C:\\Windows\\SysWOW64\\avifil32.dll"	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D06818FC-4374-8FAD-76B6-BC3885DF62D8}\InprocServer32\ThreadingModel = "Both"	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe

NTFS ADS 2 IoCs

description	ioc	Process
File created	C:\ProgramData\TEMP:E0EC633E	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
File opened for modification	C:\ProgramData\TEMP:E0EC633E	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: 33	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Token: SeIncBasePriorityPrivilege	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Token: 33	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
Token: SeIncBasePriorityPrivilege	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
4576	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 5256 wrote to memory of 4576	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	92
PID 5256 wrote to memory of 4576	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	92
PID 5256 wrote to memory of 4576	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	92
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 5256 wrote to memory of 4576	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	92
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 5256 wrote to memory of 4576	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	92
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 5256 wrote to memory of 4576	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	92
PID 5256 wrote to memory of 4576	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	92
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 5256 wrote to memory of 4576	5256	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	92
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87
PID 116 wrote to memory of 5256	116	JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe	87

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:116
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe"
  2⤵
  - Checks BIOS information in registry
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - NTFS ADS
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5256
- - C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
    C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    PID:4576
  - - C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_97c58b8ea171d3f901800e34c69141c3.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
      4⤵
      System Location Discovery: System Language Discovery
      PID:4676

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/116-0-0x0000000000400000-0x0000000000763000-memory.dmp

Filesize
3.4MB

Download
memory/116-29-0x0000000000400000-0x0000000000763000-memory.dmp

Filesize
3.4MB

Download
memory/4576-20-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/4576-45-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/4576-23-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/4676-28-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4676-36-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4676-37-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4676-41-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4676-33-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5256-17-0x0000000002560000-0x00000000026A2000-memory.dmp

Filesize
1.3MB

Download
memory/5256-4-0x0000000002560000-0x00000000026A2000-memory.dmp

Filesize
1.3MB

Download
memory/5256-25-0x0000000002560000-0x00000000026A2000-memory.dmp

Filesize
1.3MB

Download
memory/5256-10-0x0000000002560000-0x00000000026A2000-memory.dmp

Filesize
1.3MB

Download
memory/5256-14-0x0000000000400000-0x0000000000763000-memory.dmp

Filesize
3.4MB

Download
memory/5256-16-0x0000000000400000-0x0000000000763000-memory.dmp

Filesize
3.4MB

Download
memory/5256-3-0x0000000000400000-0x0000000000763000-memory.dmp

Filesize
3.4MB

Download
memory/5256-15-0x0000000000400000-0x0000000000763000-memory.dmp

Filesize
3.4MB

Download