isrstealer | 83ea254f1a8476977d5ce7d1afc95cc5a377c4232b8f41f4e7735185905cf5cf

General

Target

c59b106da450b6a75249a068d1337564_JaffaCakes118.exe
Size

676KB
MD5

c59b106da450b6a75249a068d1337564
SHA1

bc5641774b4ebebe55be2451e2166f6e5172021f
SHA256

83ea254f1a8476977d5ce7d1afc95cc5a377c4232b8f41f4e7735185905cf5cf
SHA512

1f24cf40de161ec83b12b077189bdee07e716a2be1c98dd3f983e8d4a443b71244c08e47a2dfca6f220cec73553262c1cab693e3f3bbe6c7f4cabc42912dfd24
SSDEEP

12288:APc2CrUyTlbuACIoFtrr8FFs4yleK062mqUkqWzF+c5W8hGiEB:Ap+lbuA67r8Fm48/2mqrR+2WhB

Score

10^/10

isrstealer bootkit credential_access discovery persistence 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 6 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1952-19-0x0000000000400000-0x0000000000484000-memory.dmp	family_isrstealer
behavioral1/memory/1952-21-0x0000000000400000-0x0000000000484000-memory.dmp	family_isrstealer
behavioral1/memory/1952-17-0x0000000000400000-0x0000000000484000-memory.dmp	family_isrstealer
behavioral1/memory/1952-13-0x0000000000400000-0x0000000000484000-memory.dmp	family_isrstealer
C:\Users\Admin\AppData\Local\Temp\SERVER.EXE	family_isrstealer
behavioral1/memory/1952-47-0x0000000000400000-0x0000000000484000-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
Executes dropped EXE 3 IoCs

Processes:

ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXESERVER.EXESERVER.EXE

pid process

2976 ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE
3040 SERVER.EXE
2700 SERVER.EXE
Loads dropped DLL 5 IoCs

Processes:

vbc.exeSERVER.EXE

pid process

1952 vbc.exe
1952 vbc.exe
1952 vbc.exe
1952 vbc.exe
3040 SERVER.EXE
Reads user/profile data of web browsers 2 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

pid	process
2976	ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE
3040	SERVER.EXE
2700	SERVER.EXE

pid	process
1952	vbc.exe
1952	vbc.exe
1952	vbc.exe
1952	vbc.exe
3040	SERVER.EXE

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral1/memory/2700-56-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2700-57-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2700-55-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2700-53-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2700-59-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064
Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
bootkit persistence

Bootkit
T1542.003

Processes:

ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE

description ioc process

File opened for modification \??\PhysicalDrive0 ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE

description	ioc	process
File opened for modification	\??\PhysicalDrive0	ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE

Suspicious use of SetThreadContext 2 IoCs

Processes:

c59b106da450b6a75249a068d1337564_JaffaCakes118.exeSERVER.EXE

description	pid	process	target process
PID 2776 set thread context of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 3040 set thread context of 2700	3040	SERVER.EXE	SERVER.EXE

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

Processes:

SERVER.EXESERVER.EXEc59b106da450b6a75249a068d1337564_JaffaCakes118.exevbc.exeADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	SERVER.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	SERVER.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE

Modifies registry class 3 IoCs

Processes:

ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.key	ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.key\	ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.key\ = "regfile"	ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

SERVER.EXE

pid process

3040 SERVER.EXE

pid	process
3040	SERVER.EXE

Suspicious use of WriteProcessMemory 28 IoCs

Processes:

c59b106da450b6a75249a068d1337564_JaffaCakes118.exevbc.exeSERVER.EXE

description	pid	process	target process
PID 2776 wrote to memory of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 2776 wrote to memory of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 2776 wrote to memory of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 2776 wrote to memory of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 2776 wrote to memory of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 2776 wrote to memory of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 2776 wrote to memory of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 2776 wrote to memory of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 2776 wrote to memory of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 2776 wrote to memory of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 2776 wrote to memory of 1952	2776	c59b106da450b6a75249a068d1337564_JaffaCakes118.exe	vbc.exe
PID 1952 wrote to memory of 2976	1952	vbc.exe	ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE
PID 1952 wrote to memory of 2976	1952	vbc.exe	ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE
PID 1952 wrote to memory of 2976	1952	vbc.exe	ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE
PID 1952 wrote to memory of 2976	1952	vbc.exe	ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE
PID 1952 wrote to memory of 3040	1952	vbc.exe	SERVER.EXE
PID 1952 wrote to memory of 3040	1952	vbc.exe	SERVER.EXE
PID 1952 wrote to memory of 3040	1952	vbc.exe	SERVER.EXE
PID 1952 wrote to memory of 3040	1952	vbc.exe	SERVER.EXE
PID 3040 wrote to memory of 2700	3040	SERVER.EXE	SERVER.EXE
PID 3040 wrote to memory of 2700	3040	SERVER.EXE	SERVER.EXE
PID 3040 wrote to memory of 2700	3040	SERVER.EXE	SERVER.EXE
PID 3040 wrote to memory of 2700	3040	SERVER.EXE	SERVER.EXE
PID 3040 wrote to memory of 2700	3040	SERVER.EXE	SERVER.EXE
PID 3040 wrote to memory of 2700	3040	SERVER.EXE	SERVER.EXE
PID 3040 wrote to memory of 2700	3040	SERVER.EXE	SERVER.EXE
PID 3040 wrote to memory of 2700	3040	SERVER.EXE	SERVER.EXE
PID 3040 wrote to memory of 2700	3040	SERVER.EXE	SERVER.EXE

C:\Users\Admin\AppData\Local\Temp\c59b106da450b6a75249a068d1337564_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\c59b106da450b6a75249a068d1337564_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2776
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  "C:\\Windows\\Microsoft.NET\\Framework\\v2.0.50727\\vbc.exe"
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1952
- - C:\Users\Admin\AppData\Local\Temp\ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE
    "C:\Users\Admin\AppData\Local\Temp\ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE"
    3⤵
    - Executes dropped EXE
    - Writes to the Master Boot Record (MBR)
    - System Location Discovery: System Language Discovery
    - Modifies registry class
    PID:2976
- - C:\Users\Admin\AppData\Local\Temp\SERVER.EXE
    "C:\Users\Admin\AppData\Local\Temp\SERVER.EXE"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3040
  - - C:\Users\Admin\AppData\Local\Temp\SERVER.EXE
      /scomma "C:\Users\Admin\AppData\Local\Temp\k5TYJti58Q.ini"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:2700

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scripting

1

T1064

Persistence

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

1

T1542

Bootkit

Scripting

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\ADOBE CS 5.5 MASTER COLLECTION KEYGEN.EXE

Filesize
250KB

MD5
e2f0f90da62a446c3ebe72ca23b0c5b1

SHA1
b586c35580fea9b6964faff570fb0472c687a317

SHA256
695bbe8783fd8540e6ecdabb23f228269a59c703611dfcd290cb0d512da3098a

SHA512
1d177cb993b446c940616b659038016ab83c4b3c2122ef82ba98e8e278cac54bfe90a8a4dad21f4a2c96d733198001b58a8fd2b7755d3741845c3840c270549d

Download Submit
C:\Users\Admin\AppData\Local\Temp\SERVER.EXE

Filesize
208KB

MD5
007a8e29949c84a56447f5d8e3dab4d6

SHA1
a6c5dcfa0d12588e14e30248916540d4ace26692

SHA256
d28123396918c102b8da1ebb2ac106082d01f981abbf34bdd4552e820a432072

SHA512
eb913a582a623928f7fc8199e4ae1be5b7eef52c3d7b6b31538aa13615e3f89a0207f4cae16781ed1ad441bee3a2597f7909f83ef6683a22190590c2155e07aa

Download Submit
C:\Users\Admin\AppData\Local\Temp\k5TYJti58Q.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1952-47-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1952-11-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1952-21-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1952-5-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1952-17-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1952-15-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1952-13-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1952-3-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1952-7-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1952-9-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1952-19-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1952-33-0x00000000024A0000-0x0000000002508000-memory.dmp

Filesize
416KB

Download
memory/1952-34-0x00000000024A0000-0x0000000002508000-memory.dmp

Filesize
416KB

Download
memory/2700-56-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2700-57-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2700-55-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2700-53-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2700-59-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2776-0-0x0000000074E51000-0x0000000074E52000-memory.dmp

Filesize
4KB

Download
memory/2776-2-0x0000000074E50000-0x00000000753FB000-memory.dmp

Filesize
5.7MB

Download
memory/2776-22-0x0000000074E50000-0x00000000753FB000-memory.dmp

Filesize
5.7MB

Download
memory/2776-1-0x0000000074E50000-0x00000000753FB000-memory.dmp

Filesize
5.7MB

Download
memory/2976-39-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2976-40-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2976-35-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads