isrstealer | 3d7c8a42946451e1e1a6f785ec3ac4e124fdb86327b9c1b5e4ae17ecd1917803

General

Target

JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe
Size

252KB
MD5

03507c5f564fdaa2e852a08816fb2c4c
SHA1

2b0dc8fdc63e769e7a974cf99481e6f65904d729
SHA256

3d7c8a42946451e1e1a6f785ec3ac4e124fdb86327b9c1b5e4ae17ecd1917803
SHA512

244d8ae77e756800a5b929a29f367835165a365826468a22c0da8e5974149d90a5dd02c41c8e71ebbc714fae75258afc0b52a5fdd142e1bc3199101488ddbbc4
SSDEEP

6144:Y1H8haUM1D+dUxUun1hprvT0u4kXFO76X451p:YW0D+dUKunzVr0uTXFOu451p

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/2364-3-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/2364-5-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/2364-22-0x0000000000400000-0x0000000000432000-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 4588 set thread context of 2364	4588	JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe	84
PID 2364 set thread context of 512	2364	vbc.exe	85

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/512-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/512-15-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/512-19-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/512-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/512-12-0x0000000000400000-0x0000000000453000-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_03507c5f564fdaa2e852a08816fb2c4c.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
2364	vbc.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 4588 wrote to memory of 2364	4588	JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe	84
PID 4588 wrote to memory of 2364	4588	JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe	84
PID 4588 wrote to memory of 2364	4588	JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe	84
PID 4588 wrote to memory of 2364	4588	JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe	84
PID 4588 wrote to memory of 2364	4588	JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe	84
PID 4588 wrote to memory of 2364	4588	JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe	84
PID 4588 wrote to memory of 2364	4588	JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe	84
PID 4588 wrote to memory of 2364	4588	JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe	84
PID 2364 wrote to memory of 512	2364	vbc.exe	85
PID 2364 wrote to memory of 512	2364	vbc.exe	85
PID 2364 wrote to memory of 512	2364	vbc.exe	85
PID 2364 wrote to memory of 512	2364	vbc.exe	85
PID 2364 wrote to memory of 512	2364	vbc.exe	85
PID 2364 wrote to memory of 512	2364	vbc.exe	85
PID 2364 wrote to memory of 512	2364	vbc.exe	85
PID 2364 wrote to memory of 512	2364	vbc.exe	85

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_03507c5f564fdaa2e852a08816fb2c4c.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4588
- 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:2364
- - 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:512

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/512-19-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/512-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/512-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/512-17-0x0000000000460000-0x0000000000529000-memory.dmp

Filesize
804KB

Download
memory/512-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/512-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2364-5-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/2364-3-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/2364-22-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/4588-14-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/4588-8-0x0000000000720000-0x0000000000730000-memory.dmp

Filesize
64KB

Download
memory/4588-0-0x0000000075422000-0x0000000075423000-memory.dmp

Filesize
4KB

Download
memory/4588-2-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/4588-1-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download

Analysis

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