isrstealer | 51c318592661ec3e2f17669ca0a666b59054a423ef1371f5b193388affe24c6e

General

Target

bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe
Size

116KB
MD5

bf1c0c4d3a3f288fd72ab11478ef2443
SHA1

05742949ed8897cd4ae026049636df857165cdba
SHA256

51c318592661ec3e2f17669ca0a666b59054a423ef1371f5b193388affe24c6e
SHA512

6901d6a4caf669d98f1545f7083b41d9f8378befcf9346d9a62595e2d6113896054610716ea9f75d05c79ead70da07a75205db8963544b6e89357b1d05e55cb8
SSDEEP

1536:RNzJ67GFYiExZdg9SpGz39h2WxFSn9ziAN0vvyLcyoW1mc+:6rdpGz39hhA9ziACHyLBi

Score

10^/10

isrstealer discovery persistence spyware 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 3 IoCs

resource	yara_rule
behavioral1/memory/2028-7-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/2028-14-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/2028-16-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer

Executes dropped EXE 1 IoCs

pid	Process
2028	mavwcxwt.exe

Loads dropped DLL 1 IoCs

pid	Process
1716	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\z4mdpiq544cam2iut4sjcy2d = "C:\\Users\\Admin\\AppData\\Roaming\\odhpytqg\\"	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1716 set thread context of 2028	1716	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe	28

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 2 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	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mavwcxwt.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2028	mavwcxwt.exe
2028	mavwcxwt.exe
2028	mavwcxwt.exe
2028	mavwcxwt.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2028	mavwcxwt.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1716 wrote to memory of 2028	1716	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe	28
PID 1716 wrote to memory of 2028	1716	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe	28
PID 1716 wrote to memory of 2028	1716	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe	28
PID 1716 wrote to memory of 2028	1716	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe	28
PID 1716 wrote to memory of 2028	1716	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe	28
PID 1716 wrote to memory of 2028	1716	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe	28
PID 1716 wrote to memory of 2028	1716	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe	28
PID 1716 wrote to memory of 2028	1716	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe	28
PID 1716 wrote to memory of 2028	1716	bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe	28

C:\Users\Admin\AppData\Local\Temp\bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\bf1c0c4d3a3f288fd72ab11478ef2443_JaffaCakes118.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1716
- C:\Users\Admin\AppData\Local\Temp\mavwcxwt.exe
  C:\Users\Admin\AppData\Local\Temp\mavwcxwt.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  PID:2028

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Unsecured Credentials

2

T1552

Credentials In Files

2

T1552.001

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

\Users\Admin\AppData\Local\Temp\mavwcxwt.exe

Filesize
1.1MB

MD5
34aa912defa18c2c129f1e09d75c1d7e

SHA1
9c3046324657505a30ecd9b1fdb46c05bde7d470

SHA256
6df94b7fa33f1b87142adc39b3db0613fc520d9e7a5fd6a5301dd7f51f8d0386

SHA512
d1ea9368f5d7166180612fd763c87afb647d088498887961f5e7fb0a10f4a808bd5928e8a3666d70ff794093c51ecca8816f75dd47652fd4eb23dce7f9aa1f98

Download Submit
memory/1716-0-0x00000000745A1000-0x00000000745A2000-memory.dmp

Filesize
4KB

Download
memory/1716-1-0x00000000745A0000-0x0000000074B4B000-memory.dmp

Filesize
5.7MB

Download
memory/1716-2-0x00000000745A0000-0x0000000074B4B000-memory.dmp

Filesize
5.7MB

Download
memory/1716-13-0x00000000745A0000-0x0000000074B4B000-memory.dmp

Filesize
5.7MB

Download
memory/2028-7-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2028-14-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2028-16-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads