isrstealer | 9f0299852e524b9529bc35bb2111056d12daafa288bd70a2083ba0f89a5e844d

General

Target

f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe
Size

5.4MB
MD5

f5ac6de771e6461eb4c5bb7f52939430
SHA1

59f3f7d55d67b6aed496fa3d82f843082268732f
SHA256

9f0299852e524b9529bc35bb2111056d12daafa288bd70a2083ba0f89a5e844d
SHA512

26bb9469529fc7bfee5e0aace7daf0ccd8a5566a1eca514dbfc58bde304f277936e1b3c0fb111fa31d32f39fbc4f8a17f86a66f0faa845dbc761212f73d91ae2
SSDEEP

6144:7/m9kF4LhB959Ak24Fa8yVRasuSuvfQ1dskAsaJraBCDorAB:bfFWB9bpFatVMPfgsVpraB

Score

10^/10

isrstealer discovery 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/1612-3-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/1612-5-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/1612-19-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/1612-24-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

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-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2912 set thread context of 1612	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	82
PID 1612 set thread context of 856	1612	vbc.exe	83

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/856-8-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/856-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/856-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/856-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/856-15-0x0000000000400000-0x0000000000453000-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	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4960	cmd.exe
4184	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4184	PING.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1612	vbc.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2912 wrote to memory of 1612	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	82
PID 2912 wrote to memory of 1612	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	82
PID 2912 wrote to memory of 1612	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	82
PID 2912 wrote to memory of 1612	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	82
PID 2912 wrote to memory of 1612	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	82
PID 2912 wrote to memory of 1612	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	82
PID 2912 wrote to memory of 1612	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	82
PID 2912 wrote to memory of 1612	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	82
PID 1612 wrote to memory of 856	1612	vbc.exe	83
PID 1612 wrote to memory of 856	1612	vbc.exe	83
PID 1612 wrote to memory of 856	1612	vbc.exe	83
PID 1612 wrote to memory of 856	1612	vbc.exe	83
PID 1612 wrote to memory of 856	1612	vbc.exe	83
PID 1612 wrote to memory of 856	1612	vbc.exe	83
PID 1612 wrote to memory of 856	1612	vbc.exe	83
PID 1612 wrote to memory of 856	1612	vbc.exe	83
PID 2912 wrote to memory of 4960	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	84
PID 2912 wrote to memory of 4960	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	84
PID 2912 wrote to memory of 4960	2912	f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe	84
PID 4960 wrote to memory of 4184	4960	cmd.exe	86
PID 4960 wrote to memory of 4184	4960	cmd.exe	86
PID 4960 wrote to memory of 4184	4960	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2912
- 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:1612
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\wfHW91K9DK.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:856
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C ping 1.1.1.1 -n 1 -w 1000 > Nul & Del "C:\Users\Admin\AppData\Local\Temp\f5ac6de771e6461eb4c5bb7f52939430_JaffaCakes118.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:4960
- - C:\Windows\SysWOW64\PING.EXE
    ping 1.1.1.1 -n 1 -w 1000
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:4184

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\wfHW91K9DK.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/856-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/856-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/856-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/856-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/856-8-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1612-5-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1612-3-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1612-19-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1612-22-0x0000000000440000-0x0000000000509000-memory.dmp

Filesize
804KB

Download
memory/1612-24-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2912-2-0x0000000074A60000-0x0000000075011000-memory.dmp

Filesize
5.7MB

Download
memory/2912-0-0x0000000074A62000-0x0000000074A63000-memory.dmp

Filesize
4KB

Download
memory/2912-17-0x0000000074A60000-0x0000000075011000-memory.dmp

Filesize
5.7MB

Download
memory/2912-1-0x0000000074A60000-0x0000000075011000-memory.dmp

Filesize
5.7MB

Download

Analysis

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