isrstealer | 3d2d9c5b0eb236855f300b3f5e5ac81236ee6f0df1a8cb9cbab461b296930316

General

Target

f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe
Size

383KB
MD5

f2aba5d2e89df152fb6e8dc296725e96
SHA1

1a6c7a2d6cf519e50a1c3b79380eba5c122024ee
SHA256

3d2d9c5b0eb236855f300b3f5e5ac81236ee6f0df1a8cb9cbab461b296930316
SHA512

22cd91a5dc70533d260e1d6b0eb80d54b5cbb2183b6a3da6f1b894b64b6e0e4efcb9b17d0166087931f32a5b384b4f752c471bacf2f2a02ec98e259bb7d1bebe
SSDEEP

6144:nZqi90eTTUxWwog5Df18LZTelTNqPQ4KNSZEePRttaB693aafQoBuixwlZDTxP07:nZZ90eTNwog5D+LBSTNWQ4+SZEmnaB6J

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/3816-3-0x0000000000400000-0x0000000000433000-memory.dmp	family_isrstealer
behavioral2/memory/3816-6-0x0000000000400000-0x0000000000433000-memory.dmp	family_isrstealer
behavioral2/memory/3816-21-0x0000000000400000-0x0000000000433000-memory.dmp	family_isrstealer

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2788 set thread context of 3816	2788	f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe	82
PID 3816 set thread context of 2876	3816	vbc.exe	83

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2876-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2876-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2876-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2876-14-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2876-18-0x0000000000400000-0x0000000000453000-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	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3816	vbc.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 2788 wrote to memory of 3816	2788	f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe	82
PID 2788 wrote to memory of 3816	2788	f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe	82
PID 2788 wrote to memory of 3816	2788	f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe	82
PID 2788 wrote to memory of 3816	2788	f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe	82
PID 2788 wrote to memory of 3816	2788	f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe	82
PID 2788 wrote to memory of 3816	2788	f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe	82
PID 2788 wrote to memory of 3816	2788	f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe	82
PID 2788 wrote to memory of 3816	2788	f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe	82
PID 3816 wrote to memory of 2876	3816	vbc.exe	83
PID 3816 wrote to memory of 2876	3816	vbc.exe	83
PID 3816 wrote to memory of 2876	3816	vbc.exe	83
PID 3816 wrote to memory of 2876	3816	vbc.exe	83
PID 3816 wrote to memory of 2876	3816	vbc.exe	83
PID 3816 wrote to memory of 2876	3816	vbc.exe	83
PID 3816 wrote to memory of 2876	3816	vbc.exe	83
PID 3816 wrote to memory of 2876	3816	vbc.exe	83

C:\Users\Admin\AppData\Local\Temp\f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\f2aba5d2e89df152fb6e8dc296725e96_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2788
- 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:3816
- - 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:2876

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

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/2788-9-0x0000000074670000-0x0000000074C21000-memory.dmp

Filesize
5.7MB

Download
memory/2788-1-0x0000000074670000-0x0000000074C21000-memory.dmp

Filesize
5.7MB

Download
memory/2788-2-0x0000000074670000-0x0000000074C21000-memory.dmp

Filesize
5.7MB

Download
memory/2788-0-0x0000000074672000-0x0000000074673000-memory.dmp

Filesize
4KB

Download
memory/2876-14-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2876-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2876-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2876-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2876-18-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2876-16-0x0000000000460000-0x0000000000529000-memory.dmp

Filesize
804KB

Download
memory/3816-6-0x0000000000400000-0x0000000000433000-memory.dmp

Filesize
204KB

Download
memory/3816-3-0x0000000000400000-0x0000000000433000-memory.dmp

Filesize
204KB

Download
memory/3816-21-0x0000000000400000-0x0000000000433000-memory.dmp

Filesize
204KB

Download

Analysis

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