isrstealer | b6077289fa1c83c97422fbc93892b5a05bea9fab7cb4d6f64c8ed12add22bbb2

Analysis

max time kernel
134s
max time network
104s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
22-08-2024 23:30

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General

Target

b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
Size

713KB
MD5

b97e11c9a73b49523c5665232354449e
SHA1

e5570e2f8b5914d71a9ec54b6e3458f8eadba919
SHA256

b6077289fa1c83c97422fbc93892b5a05bea9fab7cb4d6f64c8ed12add22bbb2
SHA512

2b935e5f1d32db1a38d7479f1f8fe7ef89896e0f9041b637a0be6ecb288b9bfe8b95b5e655d8ae38e60f81d26c40369eafa349e7ef9be4ea51e5bb82d2343cac
SSDEEP

12288:9jjW2SC23NqEXtKz5s1LQk1n6qJb+0UT8lCjw4GKymr53noqSOKFYPAz:9eCwNTXAa1kCn6ab+0UTtwJKyW5g2Y

Score

10^/10

isrstealer credential_access discovery persistence stealer trojan

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/3768-8-0x0000000000400000-0x0000000000451000-memory.dmp	family_isrstealer
behavioral2/memory/3768-10-0x0000000000400000-0x0000000000451000-memory.dmp	family_isrstealer
behavioral2/memory/3768-33-0x0000000000400000-0x0000000000451000-memory.dmp	family_isrstealer
behavioral2/memory/3768-40-0x0000000000400000-0x0000000000451000-memory.dmp	family_isrstealer

Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Detected Nirsoft tools 3 IoCs

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

resource	yara_rule
behavioral2/memory/1664-28-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/1664-23-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/1664-20-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/1664-28-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/1664-23-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/1664-20-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

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-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	b97e11c9a73b49523c5665232354449e_JaffaCakes118.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-1-5-21-1302416131-1437503476-2806442725-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\xfUofWj = "C:\\Users\\Admin\\AppData\\Roaming\\xfUofWj.exe"	WScript.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1884 set thread context of 3768	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	89
PID 3768 set thread context of 4200	3768	cvtres.exe	90
PID 4200 set thread context of 1664	4200	cvtres.exe	91

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	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.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

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000_Classes\Local Settings	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
3768	cvtres.exe
3768	cvtres.exe
3768	cvtres.exe
3768	cvtres.exe
3768	cvtres.exe
3768	cvtres.exe
3768	cvtres.exe
3768	cvtres.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3768	cvtres.exe

Suspicious use of WriteProcessMemory 32 IoCs

description	pid	Process	procid_target
PID 1884 wrote to memory of 2324	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	86
PID 1884 wrote to memory of 2324	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	86
PID 1884 wrote to memory of 2324	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	86
PID 1884 wrote to memory of 4100	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	88
PID 1884 wrote to memory of 4100	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	88
PID 1884 wrote to memory of 4100	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	88
PID 1884 wrote to memory of 3768	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	89
PID 1884 wrote to memory of 3768	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	89
PID 1884 wrote to memory of 3768	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	89
PID 1884 wrote to memory of 3768	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	89
PID 1884 wrote to memory of 3768	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	89
PID 1884 wrote to memory of 3768	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	89
PID 1884 wrote to memory of 3768	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	89
PID 1884 wrote to memory of 3768	1884	b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe	89
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 3768 wrote to memory of 4200	3768	cvtres.exe	90
PID 4200 wrote to memory of 1664	4200	cvtres.exe	91
PID 4200 wrote to memory of 1664	4200	cvtres.exe	91
PID 4200 wrote to memory of 1664	4200	cvtres.exe	91
PID 4200 wrote to memory of 1664	4200	cvtres.exe	91
PID 4200 wrote to memory of 1664	4200	cvtres.exe	91

C:\Users\Admin\AppData\Local\Temp\b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b97e11c9a73b49523c5665232354449e_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1884
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C ren C:\Users\Admin\AppData\Roaming\xfUofWj xfUofWj.exe && exit
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2324
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Temp344.vbs"
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  PID:4100
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
  C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3768
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
    "C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4200
  - - C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
      "C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp
      4⤵
      System Location Discovery: System Language Discovery
      PID:1664

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

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Temp344.vbs

Filesize
252B

MD5
eaaca650e8f69467a99b8d42cd5b4af2

SHA1
d9b2724350966d7b28df3449beb9763ed64354ca

SHA256
6bb1e88dfc79420fee1aef2a4b89f42c5708577e7259255a6d7eed8a1b80d87a

SHA512
fe5db29ebfe56edc2e5fab575d5cd1d8550fdd3403086ed5cfe89fa1c621562e2bd8294ed780c2c55ea870924169180348857b11e5a25cd91972607a48797985

Download Submit
C:\Users\Admin\AppData\Roaming\xfUofWj

Filesize
713KB

MD5
b97e11c9a73b49523c5665232354449e

SHA1
e5570e2f8b5914d71a9ec54b6e3458f8eadba919

SHA256
b6077289fa1c83c97422fbc93892b5a05bea9fab7cb4d6f64c8ed12add22bbb2

SHA512
2b935e5f1d32db1a38d7479f1f8fe7ef89896e0f9041b637a0be6ecb288b9bfe8b95b5e655d8ae38e60f81d26c40369eafa349e7ef9be4ea51e5bb82d2343cac

Download Submit
memory/1664-20-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/1664-23-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/1664-28-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/1884-31-0x0000000074E10000-0x00000000753C1000-memory.dmp

Filesize
5.7MB

Download
memory/1884-0-0x0000000074E12000-0x0000000074E13000-memory.dmp

Filesize
4KB

Download
memory/1884-42-0x0000000074E10000-0x00000000753C1000-memory.dmp

Filesize
5.7MB

Download
memory/1884-11-0x0000000000D40000-0x0000000000D50000-memory.dmp

Filesize
64KB

Download
memory/1884-19-0x0000000000D40000-0x0000000000D50000-memory.dmp

Filesize
64KB

Download
memory/1884-35-0x0000000000D40000-0x0000000000D50000-memory.dmp

Filesize
64KB

Download
memory/1884-34-0x0000000000D40000-0x0000000000D50000-memory.dmp

Filesize
64KB

Download
memory/1884-2-0x0000000074E10000-0x00000000753C1000-memory.dmp

Filesize
5.7MB

Download
memory/1884-32-0x0000000074E10000-0x00000000753C1000-memory.dmp

Filesize
5.7MB

Download
memory/1884-1-0x0000000074E10000-0x00000000753C1000-memory.dmp

Filesize
5.7MB

Download
memory/1884-30-0x0000000074E12000-0x0000000074E13000-memory.dmp

Filesize
4KB

Download
memory/3768-10-0x0000000000400000-0x0000000000451000-memory.dmp

Filesize
324KB

Download
memory/3768-33-0x0000000000400000-0x0000000000451000-memory.dmp

Filesize
324KB

Download
memory/3768-8-0x0000000000400000-0x0000000000451000-memory.dmp

Filesize
324KB

Download
memory/3768-40-0x0000000000400000-0x0000000000451000-memory.dmp

Filesize
324KB

Download
memory/4200-15-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/4200-16-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/4200-18-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/4200-25-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/4200-17-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download