isrstealer | 7e13c6933f03854380745c5e9ce130e16d95e18d1575e9616c76ae2174f03e02

General

Target

a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe
Size

376KB
MD5

a50e46671310b11f10127a511a7851cb
SHA1

c1c44ac58d92a0654d27a9c9f4ff87992f8f8bce
SHA256

7e13c6933f03854380745c5e9ce130e16d95e18d1575e9616c76ae2174f03e02
SHA512

44c8a918ca0fe67d09330ca641f251ab4c44528a46fa316560c1b1a9353bcde2ec466f94a53462e1e48ca57f55ab535b250c7eae5aa8c41fa2a030097561355b
SSDEEP

6144:iWGTfT4xEEmmETtSXBbKYwaq5TwjJCi/vv98gMUVbviIKzKxwV:hmmETYXBbRwaqBEP9uYmImKxo

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 3 IoCs

resource	yara_rule
behavioral2/memory/3356-8-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/3356-9-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/3356-24-0x0000000000400000-0x0000000000432000-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
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

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4680-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4680-16-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4680-18-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4680-17-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4680-22-0x0000000000400000-0x0000000000453000-memory.dmp	upx

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

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1664 set thread context of 2120	1664	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	89
PID 2120 set thread context of 3356	2120	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	90
PID 3356 set thread context of 4680	3356	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	91

System Location Discovery: System Language Discovery 1 TTPs 4 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	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1664	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe
2120	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe
3356	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1664 wrote to memory of 2120	1664	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	89
PID 1664 wrote to memory of 2120	1664	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	89
PID 1664 wrote to memory of 2120	1664	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	89
PID 1664 wrote to memory of 2120	1664	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	89
PID 1664 wrote to memory of 2120	1664	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	89
PID 1664 wrote to memory of 2120	1664	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	89
PID 1664 wrote to memory of 2120	1664	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	89
PID 1664 wrote to memory of 2120	1664	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	89
PID 2120 wrote to memory of 3356	2120	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	90
PID 2120 wrote to memory of 3356	2120	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	90
PID 2120 wrote to memory of 3356	2120	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	90
PID 2120 wrote to memory of 3356	2120	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	90
PID 2120 wrote to memory of 3356	2120	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	90
PID 2120 wrote to memory of 3356	2120	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	90
PID 2120 wrote to memory of 3356	2120	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	90
PID 2120 wrote to memory of 3356	2120	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	90
PID 3356 wrote to memory of 4680	3356	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	91
PID 3356 wrote to memory of 4680	3356	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	91
PID 3356 wrote to memory of 4680	3356	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	91
PID 3356 wrote to memory of 4680	3356	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	91
PID 3356 wrote to memory of 4680	3356	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	91
PID 3356 wrote to memory of 4680	3356	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	91
PID 3356 wrote to memory of 4680	3356	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	91
PID 3356 wrote to memory of 4680	3356	a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe	91

C:\Users\Admin\AppData\Local\Temp\a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1664
- C:\Users\Admin\AppData\Local\Temp\a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe"
  2⤵
  - Writes to the Master Boot Record (MBR)
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2120
- - C:\Users\Admin\AppData\Local\Temp\a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe
    "C:\Users\Admin\AppData\Local\Temp\a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3356
  - - C:\Users\Admin\AppData\Local\Temp\a50e46671310b11f10127a511a7851cb_JaffaCakes118.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
      4⤵
      System Location Discovery: System Language Discovery
      PID:4680

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

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\tmp.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/2120-2-0x0000000000400000-0x000000000043C000-memory.dmp

Filesize
240KB

Download
memory/2120-4-0x0000000000400000-0x000000000043C000-memory.dmp

Filesize
240KB

Download
memory/2120-12-0x0000000000400000-0x000000000043C000-memory.dmp

Filesize
240KB

Download
memory/3356-8-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/3356-9-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/3356-24-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/4680-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4680-16-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4680-18-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4680-17-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4680-22-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads