isrstealer | 0983fff2745c1a77e38e4409d6997148fa2f45e0ed0cc17dd62f2fea9d8be83e

Analysis

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

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
04-01-2025 15:40

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General

Target

JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe
Size

875KB
MD5

7a7cc0779765897b4d2d2ddb03994240
SHA1

b54fc72f7181f0ba97be0383a85109b48a387a68
SHA256

0983fff2745c1a77e38e4409d6997148fa2f45e0ed0cc17dd62f2fea9d8be83e
SHA512

e10fcb683a9d508920916fa30c59bc39c5119a6fb4cbc0b7ed1e91ea04c60aea1523d9e718e31d758cf78749d8dac524154dfcbaaff3de2c0d96b1fc1ae9bc02
SSDEEP

12288:+7FbjxMxXS3psW69K0JPMXS5qarnC9ppVua4H3HYEf7Fbjxx:IHLsWGK0JiS5NrnC9pLuaQzH7

Score

10^/10

isrstealer collection discovery 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/3388-39-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/3388-40-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/3388-67-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer

Isrstealer family
isrstealer

Detected Nirsoft tools 7 IoCs

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

resource	yara_rule
behavioral2/memory/4536-52-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/1192-58-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/1192-65-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/388-63-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4536-61-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/388-57-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4536-47-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/388-63-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/388-57-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/4536-52-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/4536-61-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/4536-47-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	iron.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe

Executes dropped EXE 2 IoCs

pid	Process
2980	IronViewer.exe
628	iron.exe

Uses the VBS compiler for execution 1 TTPs

Command and Scripting Interpreter
T1059

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 628 set thread context of 3388	628	iron.exe	84
PID 3388 set thread context of 1068	3388	vbc.exe	85
PID 1068 set thread context of 4536	1068	vbc.exe	86
PID 1068 set thread context of 1192	1068	vbc.exe	87
PID 1068 set thread context of 388	1068	vbc.exe	88

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1192-48-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/1192-58-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/1192-65-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/388-63-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/388-57-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/388-56-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1192-53-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/388-50-0x0000000000400000-0x000000000041F000-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	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	iron.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000_Classes\MIME\Database	vbc.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Charset	vbc.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Codepage	vbc.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
628	iron.exe
628	iron.exe
628	iron.exe
628	iron.exe
628	iron.exe
628	iron.exe
628	iron.exe
628	iron.exe
628	iron.exe
628	iron.exe
628	iron.exe
628	iron.exe
3388	vbc.exe
3388	vbc.exe
3388	vbc.exe
3388	vbc.exe
3388	vbc.exe
3388	vbc.exe
3388	vbc.exe
3388	vbc.exe
1192	vbc.exe
1192	vbc.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	3304	JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe
Token: 33	3304	JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe
Token: SeIncBasePriorityPrivilege	3304	JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe
Token: SeDebugPrivilege	628	iron.exe
Token: SeDebugPrivilege	1192	vbc.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
3388	vbc.exe
2980	IronViewer.exe
2980	IronViewer.exe

Suspicious use of WriteProcessMemory 41 IoCs

description	pid	Process	procid_target
PID 3304 wrote to memory of 2980	3304	JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe	82
PID 3304 wrote to memory of 2980	3304	JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe	82
PID 3304 wrote to memory of 628	3304	JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe	83
PID 3304 wrote to memory of 628	3304	JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe	83
PID 3304 wrote to memory of 628	3304	JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe	83
PID 628 wrote to memory of 3388	628	iron.exe	84
PID 628 wrote to memory of 3388	628	iron.exe	84
PID 628 wrote to memory of 3388	628	iron.exe	84
PID 628 wrote to memory of 3388	628	iron.exe	84
PID 628 wrote to memory of 3388	628	iron.exe	84
PID 628 wrote to memory of 3388	628	iron.exe	84
PID 628 wrote to memory of 3388	628	iron.exe	84
PID 628 wrote to memory of 3388	628	iron.exe	84
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 3388 wrote to memory of 1068	3388	vbc.exe	85
PID 1068 wrote to memory of 4536	1068	vbc.exe	86
PID 1068 wrote to memory of 4536	1068	vbc.exe	86
PID 1068 wrote to memory of 4536	1068	vbc.exe	86
PID 1068 wrote to memory of 4536	1068	vbc.exe	86
PID 1068 wrote to memory of 4536	1068	vbc.exe	86
PID 1068 wrote to memory of 1192	1068	vbc.exe	87
PID 1068 wrote to memory of 1192	1068	vbc.exe	87
PID 1068 wrote to memory of 1192	1068	vbc.exe	87
PID 1068 wrote to memory of 1192	1068	vbc.exe	87
PID 1068 wrote to memory of 1192	1068	vbc.exe	87
PID 1068 wrote to memory of 388	1068	vbc.exe	88
PID 1068 wrote to memory of 388	1068	vbc.exe	88
PID 1068 wrote to memory of 388	1068	vbc.exe	88
PID 1068 wrote to memory of 388	1068	vbc.exe	88
PID 1068 wrote to memory of 388	1068	vbc.exe	88

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7a7cc0779765897b4d2d2ddb03994240.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3304
- C:\Users\Admin\AppData\Local\Temp\IronViewer.exe
  "C:\Users\Admin\AppData\Local\Temp\IronViewer.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:2980
- C:\Users\Admin\AppData\Local\Temp\iron.exe
  "C:\Users\Admin\AppData\Local\Temp\iron.exe"
  2⤵
  - Drops file in Drivers directory
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:628
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3388
  - - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
      "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe"
      4⤵
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:1068
    - - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
        
        "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:4536
    - - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
        
        "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data1.dmp
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1192
    - - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
        
        "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data2.dmp
        5⤵
        Accesses Microsoft Outlook accounts
        System Location Discovery: System Language Discovery
        
        PID:388

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\IronViewer.exe

Filesize
178KB

MD5
830d8b3003a9f39b823b354098e5c98a

SHA1
9489cd97575fc8a4fef3de5c02e6230f52c0a4b2

SHA256
fdbd79727c91da5e6e2a7e7c02ef91bf5ab49658393ea8dd6d17ddb68f2f684e

SHA512
8f61b354a0aed4e24ce9197bea6c3e79b0cbd17840ca6d9208680e55a0e1c61083e5588ca155a1056bc5a37a6117857b403216ae91f2afeed4b93cdca5c31e48

Download Submit
C:\Users\Admin\AppData\Local\Temp\iron.exe

Filesize
644KB

MD5
882b3d16a95e4dbfd917a719a431f15b

SHA1
b8e7f6e04de07b7f66eb7501456027de7bb6ede4

SHA256
152d4a8f342422fed08ade0c3534d36b15bbae61bcdc22fbdec02a678d484b7b

SHA512
197df5e89ac8344890acb173107a6df5a445bb676d30a33bfd75a3011931397816a7ed454b8e16789995cd9b69c5bc0a27942f16c12d961f4e742553d4404cc5

Download Submit
memory/388-57-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/388-63-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/388-56-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/388-50-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/628-35-0x0000000075552000-0x0000000075554000-memory.dmp

Filesize
8KB

Download
memory/628-44-0x0000000075550000-0x0000000075B01000-memory.dmp

Filesize
5.7MB

Download
memory/628-34-0x0000000001570000-0x0000000001580000-memory.dmp

Filesize
64KB

Download
memory/628-37-0x0000000075550000-0x0000000075B01000-memory.dmp

Filesize
5.7MB

Download
memory/1068-46-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/1068-45-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/1068-51-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/1192-48-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1192-53-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1192-58-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1192-65-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1192-59-0x0000000000430000-0x00000000004F9000-memory.dmp

Filesize
804KB

Download
memory/2980-33-0x00007FFDF1D30000-0x00007FFDF26D1000-memory.dmp

Filesize
9.6MB

Download
memory/2980-32-0x00007FFDF1D30000-0x00007FFDF26D1000-memory.dmp

Filesize
9.6MB

Download
memory/2980-29-0x00007FFDF1D30000-0x00007FFDF26D1000-memory.dmp

Filesize
9.6MB

Download
memory/2980-68-0x00007FFDF1D30000-0x00007FFDF26D1000-memory.dmp

Filesize
9.6MB

Download
memory/3304-5-0x000000001BC90000-0x000000001BD2C000-memory.dmp

Filesize
624KB

Download
memory/3304-6-0x000000001B010000-0x000000001B018000-memory.dmp

Filesize
32KB

Download
memory/3304-7-0x000000001BDF0000-0x000000001BE3C000-memory.dmp

Filesize
304KB

Download
memory/3304-3-0x000000001B6B0000-0x000000001BB7E000-memory.dmp

Filesize
4.8MB

Download
memory/3304-4-0x00007FFDF1D30000-0x00007FFDF26D1000-memory.dmp

Filesize
9.6MB

Download
memory/3304-0-0x00007FFDF1FE5000-0x00007FFDF1FE6000-memory.dmp

Filesize
4KB

Download
memory/3304-36-0x00007FFDF1D30000-0x00007FFDF26D1000-memory.dmp

Filesize
9.6MB

Download
memory/3304-1-0x00007FFDF1D30000-0x00007FFDF26D1000-memory.dmp

Filesize
9.6MB

Download
memory/3304-2-0x000000001B130000-0x000000001B1D6000-memory.dmp

Filesize
664KB

Download
memory/3388-67-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/3388-39-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/3388-40-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/4536-61-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/4536-47-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/4536-52-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download