isrstealer | b23acf005a8a6e43de88cf2420811535d9ad68a9ca03a29f82f9ffcc3a1861e2

General

Target

9fc95f450783f79da496db9587c68117_JaffaCakes118.exe
Size

4.2MB
MD5

9fc95f450783f79da496db9587c68117
SHA1

4e5f2cd374b859c0e4566ce1e01e775fc8dc335a
SHA256

b23acf005a8a6e43de88cf2420811535d9ad68a9ca03a29f82f9ffcc3a1861e2
SHA512

6cf639d1efea8202837c8e2470df6c3234076465c340155f226a91108586828ceb3a5f30af9f784c5957b9eccc8a99c68ed339d35707882c6b3e63490f3e5ab5
SSDEEP

6144:7/m9kF4LhB959Ak24Fa8yVRasuSuvfQ1dskAsaJraBCDorAB:bfFWB9bpFatVMPfgsVpraB

Score

10^/10

isrstealer credential_access 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/4020-5-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4020-3-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4020-20-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4020-24-0x0000000000400000-0x0000000000435000-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

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-1-5-21-2412658365-3084825385-3340777666-1000\Control Panel\International\Geo\Nation	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/872-8-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/872-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/872-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/872-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/872-16-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4940 set thread context of 4020	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	86
PID 4020 set thread context of 872	4020	vbc.exe	88

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	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	9fc95f450783f79da496db9587c68117_JaffaCakes118.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
4444	cmd.exe
4596	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4596	PING.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4020	vbc.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 4940 wrote to memory of 4020	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	86
PID 4940 wrote to memory of 4020	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	86
PID 4940 wrote to memory of 4020	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	86
PID 4940 wrote to memory of 4020	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	86
PID 4940 wrote to memory of 4020	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	86
PID 4940 wrote to memory of 4020	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	86
PID 4940 wrote to memory of 4020	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	86
PID 4940 wrote to memory of 4020	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	86
PID 4020 wrote to memory of 872	4020	vbc.exe	88
PID 4020 wrote to memory of 872	4020	vbc.exe	88
PID 4020 wrote to memory of 872	4020	vbc.exe	88
PID 4020 wrote to memory of 872	4020	vbc.exe	88
PID 4020 wrote to memory of 872	4020	vbc.exe	88
PID 4020 wrote to memory of 872	4020	vbc.exe	88
PID 4020 wrote to memory of 872	4020	vbc.exe	88
PID 4020 wrote to memory of 872	4020	vbc.exe	88
PID 4940 wrote to memory of 4444	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	91
PID 4940 wrote to memory of 4444	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	91
PID 4940 wrote to memory of 4444	4940	9fc95f450783f79da496db9587c68117_JaffaCakes118.exe	91
PID 4444 wrote to memory of 4596	4444	cmd.exe	93
PID 4444 wrote to memory of 4596	4444	cmd.exe	93
PID 4444 wrote to memory of 4596	4444	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\9fc95f450783f79da496db9587c68117_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\9fc95f450783f79da496db9587c68117_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4940
- 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:4020
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\5zyJ86450D.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:872
- 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\9fc95f450783f79da496db9587c68117_JaffaCakes118.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:4444
- - 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:4596

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

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

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\5zyJ86450D.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/872-16-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/872-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/872-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/872-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/872-8-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4020-3-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4020-5-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4020-20-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4020-23-0x0000000000440000-0x0000000000509000-memory.dmp

Filesize
804KB

Download
memory/4020-24-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4940-2-0x0000000075160000-0x0000000075711000-memory.dmp

Filesize
5.7MB

Download
memory/4940-0-0x0000000075162000-0x0000000075163000-memory.dmp

Filesize
4KB

Download
memory/4940-18-0x0000000075160000-0x0000000075711000-memory.dmp

Filesize
5.7MB

Download
memory/4940-1-0x0000000075160000-0x0000000075711000-memory.dmp

Filesize
5.7MB

Download

Analysis

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