isrstealer | f0a7cedb8c3d373f5d661715650c2b1a8735c7b0688266e446d0317a4157114a

Analysis

max time kernel
120s
max time network
122s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
02-01-2025 01:02

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General

Target

JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe
Size

545KB
MD5

61b67439c5c363ffd8e86522e2ad9840
SHA1

063e67d372f40c2c29cb681dce8c7f79daa647df
SHA256

f0a7cedb8c3d373f5d661715650c2b1a8735c7b0688266e446d0317a4157114a
SHA512

faabc353419fc23bd1b121f049ca74f851c28041a025f9d5b81730876996f0d8188379dbcda0c31db8cb82a9a8ae3a7c6a00dfa9a8f4bc3eb0effe3733f58870
SSDEEP

12288:1ZSl6ixzAyac4h8ZppDOpc3WdcwTka6sBgUk+hS32:L5EzUipycC6UgUths2

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/2808-16-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral1/memory/2808-12-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral1/memory/2808-90-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral1/memory/2808-93-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer

Isrstealer family
isrstealer

Detected Nirsoft tools 10 IoCs

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

resource	yara_rule
behavioral1/memory/2032-64-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral1/memory/876-82-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/2032-81-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral1/memory/876-78-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/2032-66-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral1/memory/3012-65-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral1/memory/3012-54-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral1/memory/3012-53-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral1/memory/3012-87-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral1/memory/876-88-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/876-82-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/876-78-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/876-88-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 4 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/3012-65-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral1/memory/3012-54-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral1/memory/3012-53-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral1/memory/3012-87-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

Executes dropped EXE 5 IoCs

pid	Process
2808	cvtres.exe
2740	cvtres.exe
3012	cvtres.exe
2032	cvtres.exe
876	cvtres.exe

Loads dropped DLL 5 IoCs

pid	Process
2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe
2808	cvtres.exe
2740	cvtres.exe
2740	cvtres.exe
2740	cvtres.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
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	cvtres.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 2708 set thread context of 2808	2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	30
PID 2808 set thread context of 2740	2808	cvtres.exe	31
PID 2740 set thread context of 3012	2740	cvtres.exe	32
PID 2740 set thread context of 2032	2740	cvtres.exe	33
PID 2740 set thread context of 876	2740	cvtres.exe	34

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2032-64-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral1/memory/876-82-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2032-81-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral1/memory/876-78-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/876-77-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/876-71-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2032-66-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral1/memory/2032-63-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral1/memory/2032-59-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral1/memory/876-88-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 6 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	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe
2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2032	cvtres.exe
Token: SeDebugPrivilege	2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2808	cvtres.exe

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 2708 wrote to memory of 2808	2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	30
PID 2708 wrote to memory of 2808	2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	30
PID 2708 wrote to memory of 2808	2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	30
PID 2708 wrote to memory of 2808	2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	30
PID 2708 wrote to memory of 2808	2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	30
PID 2708 wrote to memory of 2808	2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	30
PID 2708 wrote to memory of 2808	2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	30
PID 2708 wrote to memory of 2808	2708	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	30
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2808 wrote to memory of 2740	2808	cvtres.exe	31
PID 2740 wrote to memory of 3012	2740	cvtres.exe	32
PID 2740 wrote to memory of 3012	2740	cvtres.exe	32
PID 2740 wrote to memory of 3012	2740	cvtres.exe	32
PID 2740 wrote to memory of 3012	2740	cvtres.exe	32
PID 2740 wrote to memory of 3012	2740	cvtres.exe	32
PID 2740 wrote to memory of 3012	2740	cvtres.exe	32
PID 2740 wrote to memory of 2032	2740	cvtres.exe	33
PID 2740 wrote to memory of 2032	2740	cvtres.exe	33
PID 2740 wrote to memory of 2032	2740	cvtres.exe	33
PID 2740 wrote to memory of 2032	2740	cvtres.exe	33
PID 2740 wrote to memory of 2032	2740	cvtres.exe	33
PID 2740 wrote to memory of 2032	2740	cvtres.exe	33
PID 2740 wrote to memory of 876	2740	cvtres.exe	34
PID 2740 wrote to memory of 876	2740	cvtres.exe	34
PID 2740 wrote to memory of 876	2740	cvtres.exe	34
PID 2740 wrote to memory of 876	2740	cvtres.exe	34
PID 2740 wrote to memory of 876	2740	cvtres.exe	34
PID 2740 wrote to memory of 876	2740	cvtres.exe	34

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2708
- C:\Users\Admin\AppData\Local\Temp\cvtres.exe
  C:\Users\Admin\AppData\Local\Temp\\cvtres.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2808
- - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
    "C:\Users\Admin\AppData\Local\Temp\cvtres.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2740
  - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
      "C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:3012
  - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
      "C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data1.dmp
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      PID:2032
  - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
      "C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data2.dmp
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      System Location Discovery: System Language Discovery
      PID:876

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

System Information Discovery

T1082

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

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\cvtres.exe

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

Download Submit
memory/876-71-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/876-77-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/876-82-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/876-78-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/876-88-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/876-67-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2032-55-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/2032-66-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/2032-59-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/2032-64-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/2032-63-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/2032-81-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/2708-83-0x0000000074D90000-0x000000007533B000-memory.dmp

Filesize
5.7MB

Download
memory/2708-3-0x0000000074D90000-0x000000007533B000-memory.dmp

Filesize
5.7MB

Download
memory/2708-1-0x0000000074D90000-0x000000007533B000-memory.dmp

Filesize
5.7MB

Download
memory/2708-0-0x0000000074D91000-0x0000000074D92000-memory.dmp

Filesize
4KB

Download
memory/2708-2-0x0000000074D90000-0x000000007533B000-memory.dmp

Filesize
5.7MB

Download
memory/2740-74-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2740-43-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2740-28-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2740-30-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2740-32-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2740-24-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2740-26-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2740-45-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2740-34-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2740-36-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2740-40-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2740-42-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/2808-90-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/2808-16-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/2808-9-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/2808-14-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2808-12-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/2808-93-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/2808-10-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/3012-65-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/3012-87-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/3012-53-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/3012-54-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/3012-46-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download