isrstealer | fb30f6f2adef10ea9f6806afb731977b7d6c67dfddd891eab99a0a8ad3048751

Analysis

max time kernel
91s
max time network
113s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
16/03/2025, 10:20

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe
Size

489KB
MD5

79dd0667f51035f1b8322d10acf1688b
SHA1

fe21c49313ad7dacdca94211eb635540551b4f28
SHA256

fb30f6f2adef10ea9f6806afb731977b7d6c67dfddd891eab99a0a8ad3048751
SHA512

921eefd772ef2d1d3553db57174cf66cbcc6bbe9f745cd68fea6e0a9683ffd860e0460a3e6037dbe4848051161631d35dea1a6ea88ce0fb195fa5e26d140a23e
SSDEEP

12288:OVW0BLp7vXRxcBAlhQaVYZiEk2NZjEpPceXQK:OVJLp7vXRqBAlhQxYLIqqK

Score

10^/10

isrstealer collection discovery persistence 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 5 IoCs

resource	yara_rule
behavioral2/memory/1544-22-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1544-25-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1544-51-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1544-57-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1544-59-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

Isrstealer family
isrstealer

Detected Nirsoft tools 2 IoCs

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

resource	yara_rule
behavioral2/memory/3108-53-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3108-56-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3108-53-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3108-56-0x0000000000400000-0x000000000041F000-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-1-5-21-3218366390-1258052702-4267193707-1000\Control Panel\International\Geo\Nation	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe

Executes dropped EXE 2 IoCs

pid	Process
3284	tmp41EB.tmp.exe
6132	tmp41EB.tmp.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-1-5-21-3218366390-1258052702-4267193707-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3218366390-1258052702-4267193707-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\17623787 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\tmp41EB.tmp.exe\""	tmp41EB.tmp.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3218366390-1258052702-4267193707-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\24008006 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\tmp41EB.tmp.exe\""	tmp41EB.tmp.exe

Drops desktop.ini file(s) 2 IoCs

description	ioc	Process
File created	C:\Windows\assembly\Desktop.ini	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4168 set thread context of 1544	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	90
PID 1544 set thread context of 4976	1544	vbc.exe	91
PID 1544 set thread context of 3108	1544	vbc.exe	92

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4976-34-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4976-39-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4976-35-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4976-33-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4976-32-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3108-50-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3108-53-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3108-52-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3108-56-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Drops file in Windows directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\assembly	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe
File created	C:\Windows\assembly\Desktop.ini	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe

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	tmp41EB.tmp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmp41EB.tmp.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	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe
Token: SeDebugPrivilege	3284	tmp41EB.tmp.exe
Token: SeDebugPrivilege	6132	tmp41EB.tmp.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1544	vbc.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 4168 wrote to memory of 3284	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	88
PID 4168 wrote to memory of 3284	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	88
PID 4168 wrote to memory of 3284	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	88
PID 4168 wrote to memory of 6132	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	89
PID 4168 wrote to memory of 6132	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	89
PID 4168 wrote to memory of 6132	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	89
PID 4168 wrote to memory of 1544	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	90
PID 4168 wrote to memory of 1544	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	90
PID 4168 wrote to memory of 1544	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	90
PID 4168 wrote to memory of 1544	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	90
PID 4168 wrote to memory of 1544	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	90
PID 4168 wrote to memory of 1544	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	90
PID 4168 wrote to memory of 1544	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	90
PID 4168 wrote to memory of 1544	4168	JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe	90
PID 1544 wrote to memory of 4976	1544	vbc.exe	91
PID 1544 wrote to memory of 4976	1544	vbc.exe	91
PID 1544 wrote to memory of 4976	1544	vbc.exe	91
PID 1544 wrote to memory of 4976	1544	vbc.exe	91
PID 1544 wrote to memory of 4976	1544	vbc.exe	91
PID 1544 wrote to memory of 4976	1544	vbc.exe	91
PID 1544 wrote to memory of 4976	1544	vbc.exe	91
PID 1544 wrote to memory of 4976	1544	vbc.exe	91
PID 1544 wrote to memory of 3108	1544	vbc.exe	92
PID 1544 wrote to memory of 3108	1544	vbc.exe	92
PID 1544 wrote to memory of 3108	1544	vbc.exe	92
PID 1544 wrote to memory of 3108	1544	vbc.exe	92
PID 1544 wrote to memory of 3108	1544	vbc.exe	92
PID 1544 wrote to memory of 3108	1544	vbc.exe	92
PID 1544 wrote to memory of 3108	1544	vbc.exe	92
PID 1544 wrote to memory of 3108	1544	vbc.exe	92

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_79dd0667f51035f1b8322d10acf1688b.exe"
1⤵
- Checks computer location settings
- Drops desktop.ini file(s)
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4168
- C:\Users\Admin\AppData\Local\Temp\tmp41EB.tmp.exe
  "C:\Users\Admin\AppData\Local\Temp\tmp41EB.tmp.exe" -p
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:3284
- C:\Users\Admin\AppData\Local\Temp\tmp41EB.tmp.exe
  "C:\Users\Admin\AppData\Local\Temp\tmp41EB.tmp.exe" -p
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:6132
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  C:\Windows\Microsoft.NET\Framework\v2.0.50727\\vbc.exe
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1544
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\FgPZkDwjBM.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4976
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\aU3ZZMLEDn.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:3108

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

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

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

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v2.0_32\UsageLogs\tmp41EB.tmp.exe.log

Filesize
217B

MD5
594f9a7c2c9174efbb2099b6b21ca0c1

SHA1
859abbb672399e195267d2ebd57395ae9153dcd0

SHA256
3f56509adf13b45203567538dcd316e5217122182ff5b051da5ea2edc6bbc9a7

SHA512
13680a4fb1d115efb80d1fc2888420c48af6429360b6d14d77a60ed57d15c29233f424955e4b840a131d40881507b1465beeac1aa258b6ca20d311a668240b7d

Download Submit
C:\Users\Admin\AppData\Local\Temp\FgPZkDwjBM.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp41EB.tmp.exe

Filesize
489KB

MD5
79dd0667f51035f1b8322d10acf1688b

SHA1
fe21c49313ad7dacdca94211eb635540551b4f28

SHA256
fb30f6f2adef10ea9f6806afb731977b7d6c67dfddd891eab99a0a8ad3048751

SHA512
921eefd772ef2d1d3553db57174cf66cbcc6bbe9f745cd68fea6e0a9683ffd860e0460a3e6037dbe4848051161631d35dea1a6ea88ce0fb195fa5e26d140a23e

Download Submit
memory/1544-51-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1544-22-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1544-25-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1544-57-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1544-59-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3108-54-0x0000000000470000-0x0000000000539000-memory.dmp

Filesize
804KB

Download
memory/3108-56-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3108-52-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3108-53-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3108-50-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3284-20-0x0000000074D00000-0x00000000752B1000-memory.dmp

Filesize
5.7MB

Download
memory/3284-16-0x0000000074D00000-0x00000000752B1000-memory.dmp

Filesize
5.7MB

Download
memory/3284-17-0x0000000074D00000-0x00000000752B1000-memory.dmp

Filesize
5.7MB

Download
memory/3284-19-0x0000000074D00000-0x00000000752B1000-memory.dmp

Filesize
5.7MB

Download
memory/4168-29-0x0000000074D00000-0x00000000752B1000-memory.dmp

Filesize
5.7MB

Download
memory/4168-1-0x0000000074D00000-0x00000000752B1000-memory.dmp

Filesize
5.7MB

Download
memory/4168-2-0x0000000074D00000-0x00000000752B1000-memory.dmp

Filesize
5.7MB

Download
memory/4168-0-0x0000000074D02000-0x0000000074D03000-memory.dmp

Filesize
4KB

Download
memory/4976-35-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4976-34-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4976-39-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4976-33-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4976-32-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/6132-27-0x0000000074D00000-0x00000000752B1000-memory.dmp

Filesize
5.7MB

Download
memory/6132-40-0x0000000074D00000-0x00000000752B1000-memory.dmp

Filesize
5.7MB

Download
memory/6132-26-0x0000000074D00000-0x00000000752B1000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads