isrstealer | 3a3998e83dc3a5e6811df57aa837db1bf29a91a21137a42eb2f800f4b97df004

General

Target

JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe
Size

252KB
MD5

de2da9fd0156ebb8a3f21d8051616ec0
SHA1

6bf39732050cf58b98a9384c84739cb3aa984d3b
SHA256

3a3998e83dc3a5e6811df57aa837db1bf29a91a21137a42eb2f800f4b97df004
SHA512

4c43ec73205d1856350f4a2974a9e66413865c48e8cb95f143483e53abb4f629ce0539ffc782c2c7202a6ef76f67bdbc85b8ef8d4f039672d3bf0e44847d373d
SSDEEP

3072:nJj8cFNq3qPHCh+C/3m0dQz+b+C/giZfT17Slbq8FQIDch7q53aY7AzplfZqPk5G:/FPH0+Cu0CG+6giv7a7DU+aY7ALCOv

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 3 IoCs

resource	yara_rule
behavioral2/memory/3404-3-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/3404-5-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/3404-23-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer

Isrstealer family
isrstealer
Uses the VBS compiler for execution 1 TTPs

Command and Scripting Interpreter
T1059

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 5112 set thread context of 3404	5112	JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe	87
PID 3404 set thread context of 5000	3404	vbc.exe	88

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/5000-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5000-15-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5000-19-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5000-14-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5000-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx

System Location Discovery: System Language Discovery 1 TTPs 3 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	JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3404	vbc.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 5112 wrote to memory of 3404	5112	JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe	87
PID 5112 wrote to memory of 3404	5112	JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe	87
PID 5112 wrote to memory of 3404	5112	JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe	87
PID 5112 wrote to memory of 3404	5112	JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe	87
PID 5112 wrote to memory of 3404	5112	JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe	87
PID 5112 wrote to memory of 3404	5112	JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe	87
PID 5112 wrote to memory of 3404	5112	JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe	87
PID 5112 wrote to memory of 3404	5112	JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe	87
PID 3404 wrote to memory of 5000	3404	vbc.exe	88
PID 3404 wrote to memory of 5000	3404	vbc.exe	88
PID 3404 wrote to memory of 5000	3404	vbc.exe	88
PID 3404 wrote to memory of 5000	3404	vbc.exe	88
PID 3404 wrote to memory of 5000	3404	vbc.exe	88
PID 3404 wrote to memory of 5000	3404	vbc.exe	88
PID 3404 wrote to memory of 5000	3404	vbc.exe	88
PID 3404 wrote to memory of 5000	3404	vbc.exe	88

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_de2da9fd0156ebb8a3f21d8051616ec0.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5112
- 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:3404
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:5000

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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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/3404-5-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/3404-23-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/3404-3-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/5000-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5000-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5000-17-0x0000000000460000-0x0000000000529000-memory.dmp

Filesize
804KB

Download
memory/5000-19-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5000-14-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5000-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5112-8-0x0000000000CF0000-0x0000000000D00000-memory.dmp

Filesize
64KB

Download
memory/5112-0-0x0000000074AC2000-0x0000000074AC3000-memory.dmp

Filesize
4KB

Download
memory/5112-20-0x0000000074AC0000-0x0000000075071000-memory.dmp

Filesize
5.7MB

Download
memory/5112-2-0x0000000074AC0000-0x0000000075071000-memory.dmp

Filesize
5.7MB

Download
memory/5112-1-0x0000000074AC0000-0x0000000075071000-memory.dmp

Filesize
5.7MB

Download

Analysis

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