isrstealer | 933e73089907d9a6031dc117d40c29ead10553c135e050feda1e08a16dd49fab

General

Target

99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe
Size

876KB
MD5

99e445a3b3a4c17256431acf01d34f2b
SHA1

129d2f8bb8f3a36e994fc99db6d24cb3b539834e
SHA256

933e73089907d9a6031dc117d40c29ead10553c135e050feda1e08a16dd49fab
SHA512

bcc908db17214e9e8979edc3c60e4283f6507d1f61a04b27c0642d6f75e8ba7b2acd0b5afee883fc92c87249d6908fa298ee1720090d05f604f7d3d856807449
SSDEEP

24576:Rd0jNhkIOUnBfeQtee2XgEi3GPYbYXd8Sa:/0jNh62I1+CfXd

Score

10^/10

isrstealer credential_access discovery stealer trojan

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
behavioral1/memory/2800-7-0x0000000000400000-0x0000000000451000-memory.dmp	family_isrstealer
behavioral1/memory/2800-11-0x0000000000400000-0x0000000000451000-memory.dmp	family_isrstealer
behavioral1/memory/2800-14-0x0000000000400000-0x0000000000451000-memory.dmp	family_isrstealer
behavioral1/memory/2800-49-0x0000000000400000-0x0000000000451000-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

Detected Nirsoft tools 4 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral1/memory/2864-41-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral1/memory/2864-45-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral1/memory/2864-46-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral1/memory/2864-53-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft

NirSoft WebBrowserPassView 4 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/2864-41-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral1/memory/2864-45-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral1/memory/2864-46-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral1/memory/2864-53-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2596 set thread context of 2800	2596	99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe	30
PID 2800 set thread context of 2096	2800	vbc.exe	31
PID 2096 set thread context of 2864	2096	vbc.exe	32

System Location Discovery: System Language Discovery 1 TTPs 4 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	99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe
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	vbc.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2800	vbc.exe
2800	vbc.exe
2800	vbc.exe
2800	vbc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2800	vbc.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 2596 wrote to memory of 2800	2596	99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe	30
PID 2596 wrote to memory of 2800	2596	99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe	30
PID 2596 wrote to memory of 2800	2596	99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe	30
PID 2596 wrote to memory of 2800	2596	99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe	30
PID 2596 wrote to memory of 2800	2596	99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe	30
PID 2596 wrote to memory of 2800	2596	99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe	30
PID 2596 wrote to memory of 2800	2596	99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe	30
PID 2596 wrote to memory of 2800	2596	99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe	30
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2800 wrote to memory of 2096	2800	vbc.exe	31
PID 2096 wrote to memory of 2864	2096	vbc.exe	32
PID 2096 wrote to memory of 2864	2096	vbc.exe	32
PID 2096 wrote to memory of 2864	2096	vbc.exe	32
PID 2096 wrote to memory of 2864	2096	vbc.exe	32
PID 2096 wrote to memory of 2864	2096	vbc.exe	32
PID 2096 wrote to memory of 2864	2096	vbc.exe	32

C:\Users\Admin\AppData\Local\Temp\99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\99e445a3b3a4c17256431acf01d34f2b_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2596
- 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 behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2800
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2096
  - - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
      "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp
      4⤵
      System Location Discovery: System Language Discovery
      PID:2864

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

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

memory/2096-17-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2096-19-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2096-29-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2096-33-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2096-44-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2096-25-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2096-34-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2096-27-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2096-35-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2096-21-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2096-23-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2096-36-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2596-1-0x0000000074D70000-0x000000007531B000-memory.dmp

Filesize
5.7MB

Download
memory/2596-0-0x0000000074D71000-0x0000000074D72000-memory.dmp

Filesize
4KB

Download
memory/2596-13-0x0000000074D70000-0x000000007531B000-memory.dmp

Filesize
5.7MB

Download
memory/2596-2-0x0000000074D70000-0x000000007531B000-memory.dmp

Filesize
5.7MB

Download
memory/2800-3-0x0000000000400000-0x0000000000451000-memory.dmp

Filesize
324KB

Download
memory/2800-47-0x0000000000460000-0x000000000053F000-memory.dmp

Filesize
892KB

Download
memory/2800-7-0x0000000000400000-0x0000000000451000-memory.dmp

Filesize
324KB

Download
memory/2800-14-0x0000000000400000-0x0000000000451000-memory.dmp

Filesize
324KB

Download
memory/2800-5-0x0000000000400000-0x0000000000451000-memory.dmp

Filesize
324KB

Download
memory/2800-9-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2800-49-0x0000000000400000-0x0000000000451000-memory.dmp

Filesize
324KB

Download
memory/2800-11-0x0000000000400000-0x0000000000451000-memory.dmp

Filesize
324KB

Download
memory/2864-46-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/2864-45-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/2864-53-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/2864-41-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/2864-51-0x0000000000460000-0x00000000004C7000-memory.dmp

Filesize
412KB

Download
memory/2864-37-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download

Analysis

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