isrstealer | f0a7cedb8c3d373f5d661715650c2b1a8735c7b0688266e446d0317a4157114a

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
02/01/2025, 01:02

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General

Target
JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe
Size 545KB
Sample250102-bdtzjavkbz
SHA256 f0a7cedb8c3d373f5d661715650c2b1a8735c7b0688266e446d0317a4157114a
MD5 61b67439c5c363ffd8e86522e2ad9840
SHA1 063e67d372f40c2c29cb681dce8c7f79daa647df
SHA512 faabc353419fc23bd1b121f049ca74f851c28041a025f9d5b81730876996f0d8188379dbcda0c31db8cb82a9a8ae3a7c6a00dfa9a8f4bc3eb0effe3733f58870
SSDEEP 12288:1ZSl6ixzAyac4h8ZppDOpc3WdcwTka6sBgUk+hS32:L5EzUipycC6UgUths2
MD5 SHA1 SHA512 SSDEEP

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
behavioral2/memory/436-12-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/436-8-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/436-52-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/436-53-0x0000000000400000-0x0000000000470000-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
behavioral2/memory/4436-23-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/4436-34-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/4436-20-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/2160-37-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/756-36-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/2160-48-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/756-42-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/4436-45-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/2160-39-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/756-38-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/2160-37-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/2160-48-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/2160-39-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 4 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/4436-23-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/4436-34-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/4436-20-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/4436-45-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

Executes dropped EXE 5 IoCs

pid	Process
436	cvtres.exe
2268	cvtres.exe
4436	cvtres.exe
756	cvtres.exe
2160	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-1-5-21-493223053-2004649691-1575712786-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	cvtres.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 3144 set thread context of 436	3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	93
PID 436 set thread context of 2268	436	cvtres.exe	94
PID 2268 set thread context of 4436	2268	cvtres.exe	95
PID 2268 set thread context of 756	2268	cvtres.exe	96
PID 2268 set thread context of 2160	2268	cvtres.exe	97

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2160-35-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2160-33-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/756-32-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/756-24-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/2160-37-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/756-36-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/2160-48-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/756-42-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/2160-39-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/756-38-0x0000000000400000-0x0000000000426000-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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
756	cvtres.exe
756	cvtres.exe
3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe
3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	756	cvtres.exe
Token: SeDebugPrivilege	3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
436	cvtres.exe

Suspicious use of WriteProcessMemory 36 IoCs

description	pid	Process	procid_target
PID 3144 wrote to memory of 436	3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	93
PID 3144 wrote to memory of 436	3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	93
PID 3144 wrote to memory of 436	3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	93
PID 3144 wrote to memory of 436	3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	93
PID 3144 wrote to memory of 436	3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	93
PID 3144 wrote to memory of 436	3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	93
PID 3144 wrote to memory of 436	3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	93
PID 3144 wrote to memory of 436	3144	JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe	93
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 436 wrote to memory of 2268	436	cvtres.exe	94
PID 2268 wrote to memory of 4436	2268	cvtres.exe	95
PID 2268 wrote to memory of 4436	2268	cvtres.exe	95
PID 2268 wrote to memory of 4436	2268	cvtres.exe	95
PID 2268 wrote to memory of 4436	2268	cvtres.exe	95
PID 2268 wrote to memory of 4436	2268	cvtres.exe	95
PID 2268 wrote to memory of 756	2268	cvtres.exe	96
PID 2268 wrote to memory of 756	2268	cvtres.exe	96
PID 2268 wrote to memory of 756	2268	cvtres.exe	96
PID 2268 wrote to memory of 756	2268	cvtres.exe	96
PID 2268 wrote to memory of 756	2268	cvtres.exe	96
PID 2268 wrote to memory of 2160	2268	cvtres.exe	97
PID 2268 wrote to memory of 2160	2268	cvtres.exe	97
PID 2268 wrote to memory of 2160	2268	cvtres.exe	97
PID 2268 wrote to memory of 2160	2268	cvtres.exe	97
PID 2268 wrote to memory of 2160	2268	cvtres.exe	97

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_61b67439c5c363ffd8e86522e2ad9840.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3144
- C:\Users\Admin\AppData\Local\Temp\cvtres.exe
  C:\Users\Admin\AppData\Local\Temp\\cvtres.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:436
- - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
    "C:\Users\Admin\AppData\Local\Temp\cvtres.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2268
  - - 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:4436
  - - 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 behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:756
  - - 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:2160

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

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Downloads

cvtres.exe

Path C:\Users\Admin\AppData\Local\Temp\cvtres.exe
Size 34KB
SHA256 3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9
MD5 e118330b4629b12368d91b9df6488be0
SHA1 ce90218c7e3b90df2a3409ec253048bb6472c2fd
SHA512 ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0
SSDEEP 768:Paq4bp49YK+2Cza0pS6icHmMl9CvwOElkn3yKdn5y85p3:ud4+KTMVJHmMsEBKdn5vj
MD5 SHA1 SHA512 SSDEEP

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data.dmp

Path C:\Users\Admin\AppData\Local\Temp\data.dmp
Size 54B
SHA256 0b6b62094048f0a069b4582f837afcb941db51340d0b16d578e8cbe8603a071e
MD5 c10dbeca73f8835240e08e4511284b83
SHA1 0032f8f941cc07768189ca6ba32b1beede6b6917
SHA512 34f7ab8b4ab7b4996b82ffc49198103ef245ee7dd5ccfec793a9ee391b9e9bb30bd3916b4ebeaa9c66a4b5ca42f8572418f16dc83d41073bc94389c19916b967
MD5 SHA1 SHA512

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memory/436-12-0x0000000000400000-0x0000000000470000-memory.dmp

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memory/436-53-0x0000000000400000-0x0000000000470000-memory.dmp

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memory/436-52-0x0000000000400000-0x0000000000470000-memory.dmp

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memory/436-8-0x0000000000400000-0x0000000000470000-memory.dmp

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memory/756-32-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/756-24-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/756-38-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/756-42-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/756-36-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/2160-35-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2160-37-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2160-39-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2160-48-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2160-33-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2268-30-0x0000000000400000-0x000000000045F000-memory.dmp

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memory/2268-18-0x0000000000400000-0x000000000045F000-memory.dmp

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memory/2268-19-0x0000000000400000-0x000000000045F000-memory.dmp

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memory/2268-17-0x0000000000400000-0x000000000045F000-memory.dmp

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memory/2268-15-0x0000000000400000-0x000000000045F000-memory.dmp

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memory/3144-4-0x0000000074DC0000-0x0000000075371000-memory.dmp

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memory/3144-1-0x0000000074DC0000-0x0000000075371000-memory.dmp

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memory/3144-0-0x0000000074DC2000-0x0000000074DC3000-memory.dmp

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memory/3144-2-0x0000000074DC0000-0x0000000075371000-memory.dmp

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memory/3144-49-0x0000000074DC0000-0x0000000075371000-memory.dmp

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memory/3144-3-0x0000000074DC2000-0x0000000074DC3000-memory.dmp

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memory/3144-5-0x0000000074DC0000-0x0000000075371000-memory.dmp

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memory/4436-34-0x0000000000400000-0x0000000000454000-memory.dmp

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memory/4436-45-0x0000000000400000-0x0000000000454000-memory.dmp

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memory/4436-23-0x0000000000400000-0x0000000000454000-memory.dmp

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memory/4436-20-0x0000000000400000-0x0000000000454000-memory.dmp

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