isrstealer | 3e878f7935ac847192050fee7712a5eab805b550aa25e6ddd68e366351714d06

Analysis

max time kernel
90s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20250217-en
resource tags

arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system
submitted
03/03/2025, 01:53

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General

Target

JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe
Size

667KB
MD5

43efa4037db761e32029b520e817a5b0
SHA1

43a12335acf9b750ff3179ea815a8153db9e8c13
SHA256

3e878f7935ac847192050fee7712a5eab805b550aa25e6ddd68e366351714d06
SHA512

a20b37db9d26ada4e4c3959baa9878aa95bfa231b8b606cbf2819fe9bc0d0cf6f9fbac160f51f4f68a8297a98b4b33feac5cab02728673338a13babcb5be84d0
SSDEEP

12288:jA8aGZNqn0BX0c6I3+IdesTqn0BX0c6I3+Ides:jAqunTnogVnTnog

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/656-8-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/656-10-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/656-22-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/656-26-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

Isrstealer family
isrstealer

Detected Nirsoft tools 1 IoCs

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

resource	yara_rule
behavioral2/memory/4584-25-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4584-25-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

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-1-5-21-1479699283-3000499823-2337359760-1000\Control Panel\International\Geo\Nation	JaffaCakes118_43efa4037db761e32029b520e817a5b0.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

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1479699283-3000499823-2337359760-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2036 set thread context of 656	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	91
PID 656 set thread context of 4912	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	98
PID 656 set thread context of 4584	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	101

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4912-14-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4912-16-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4912-18-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4912-20-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4584-23-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4584-24-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4584-25-0x0000000000400000-0x000000000041F000-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 5 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_43efa4037db761e32029b520e817a5b0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1479699283-3000499823-2337359760-1000_Classes\Local Settings	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2036 wrote to memory of 412	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	90
PID 2036 wrote to memory of 412	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	90
PID 2036 wrote to memory of 412	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	90
PID 2036 wrote to memory of 656	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	91
PID 2036 wrote to memory of 656	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	91
PID 2036 wrote to memory of 656	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	91
PID 2036 wrote to memory of 656	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	91
PID 2036 wrote to memory of 656	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	91
PID 2036 wrote to memory of 656	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	91
PID 2036 wrote to memory of 656	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	91
PID 2036 wrote to memory of 656	2036	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	91
PID 656 wrote to memory of 4912	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	98
PID 656 wrote to memory of 4912	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	98
PID 656 wrote to memory of 4912	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	98
PID 656 wrote to memory of 4912	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	98
PID 656 wrote to memory of 4912	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	98
PID 656 wrote to memory of 4912	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	98
PID 656 wrote to memory of 4912	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	98
PID 656 wrote to memory of 4912	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	98
PID 656 wrote to memory of 4584	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	101
PID 656 wrote to memory of 4584	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	101
PID 656 wrote to memory of 4584	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	101
PID 656 wrote to memory of 4584	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	101
PID 656 wrote to memory of 4584	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	101
PID 656 wrote to memory of 4584	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	101
PID 656 wrote to memory of 4584	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	101
PID 656 wrote to memory of 4584	656	JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe	101

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_43efa4037db761e32029b520e817a5b0.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:2036
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\cc.vbs"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:412
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe
  C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:656
- - C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\Eymgejeq5u.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4912
- - C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_43efa4037db761e32029b520e817a5b0.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\llqMfbyHHt.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:4584

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

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Eymgejeq5u.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\cc.vbs

Filesize
375B

MD5
1801a31cd12df7029ac0463655957c12

SHA1
620f563133832c9088b19dc097808fdc8eb8463e

SHA256
7521a6698ac86d3ec42b45ffc2de6908c61789c69c6a5881b928810f1c1a699d

SHA512
a3d34ebd5a734cc52f301e4cd46bf1cc556e0e781ac89aa8a3c7b21ceeba91b86a9a16e60afec498b3b1cc36e3911b82aac540eb0e4895ce4f9a1778c1d36cdb

Download Submit
memory/656-22-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/656-8-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/656-10-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/656-26-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2036-2-0x0000000075490000-0x0000000075A41000-memory.dmp

Filesize
5.7MB

Download
memory/2036-17-0x0000000075490000-0x0000000075A41000-memory.dmp

Filesize
5.7MB

Download
memory/2036-1-0x0000000075490000-0x0000000075A41000-memory.dmp

Filesize
5.7MB

Download
memory/2036-0-0x0000000075492000-0x0000000075493000-memory.dmp

Filesize
4KB

Download
memory/4584-23-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4584-25-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4584-24-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4912-14-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4912-20-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4912-18-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4912-16-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download