| File name: | csrss.exe |
| Full analysis: | https://app.any.run/tasks/6fabd74d-f8bd-4f6f-915d-4066ef43670d |
| Verdict: | Malicious activity |
| Threats: | njRAT is a remote access trojan. It is one of the most widely accessible RATs on the market that features an abundance of educational information. Interested attackers can even find tutorials on YouTube. This allows it to become one of the most popular RATs in the world. |
| Analysis date: | March 26, 2021, 17:24:19 |
| OS: | Windows 7 Professional Service Pack 1 (build: 7601, 32 bit) |
| Tags: | |
| Indicators: | |
| MIME: | application/x-dosexec |
| File info: | PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows |
| MD5: | D3EE834368447A84A2B59DCCBB859C6D |
| SHA1: | 47CAACBB1081295FB8C47378FA2EA2DD05FB2C7B |
| SHA256: | B3125D1EAA45A2569AF0CFEC59408C71D77D0402FA6FB229F18E8C48D805AD42 |
| SSDEEP: | 1536:ZU4OxzmVdNnCUMOKgBeiswU+4Tb7ULsGsd3r69r+N0qB:uj69n7yaeiswU+4v7HN3rer+NRB |
MALICIOUS
Changes the autorun value in the registry
- csrss.exe (PID: 3568)
NJRAT was detected
- csrss.exe (PID: 3568)
Writes to a start menu file
- csrss.exe (PID: 3568)
Connects to CnC server
- csrss.exe (PID: 3568)
SUSPICIOUS
Application launched itself
- csrss.exe (PID: 2436)
- csrss.exe (PID: 256)
Creates files in the user directory
- csrss.exe (PID: 2060)
- csrss.exe (PID: 3568)
Uses NETSH.EXE for network configuration
- csrss.exe (PID: 3568)
Starts itself from another location
- csrss.exe (PID: 2060)
Executable content was dropped or overwritten
- csrss.exe (PID: 2060)
- csrss.exe (PID: 3568)
INFO
No info indicators.
Find more information about signature artifacts and mapping to MITRE ATT&CK™ MATRIX at the full report
TRiD
| .exe | | | Generic CIL Executable (.NET, Mono, etc.) (82.9) |
|---|---|---|
| .dll | | | Win32 Dynamic Link Library (generic) (7.4) |
| .exe | | | Win32 Executable (generic) (5.1) |
| .exe | | | Generic Win/DOS Executable (2.2) |
| .exe | | | DOS Executable Generic (2.2) |
EXIF
EXE
| MachineType: | Intel 386 or later, and compatibles |
|---|---|
| TimeStamp: | 2020:06:20 09:49:12+02:00 |
| PEType: | PE32 |
| LinkerVersion: | 11 |
| CodeSize: | 59392 |
| InitializedDataSize: | 2048 |
| UninitializedDataSize: | - |
| EntryPoint: | 0x107ae |
| OSVersion: | 4 |
| ImageVersion: | - |
| SubsystemVersion: | 4 |
| Subsystem: | Windows GUI |
| FileVersionNumber: | 2.1.10.0 |
| ProductVersionNumber: | 2.1.10.0 |
| FileFlagsMask: | 0x003f |
| FileFlags: | (none) |
| FileOS: | Win32 |
| ObjectFileType: | Executable application |
| FileSubtype: | - |
| LanguageCode: | Neutral |
| CharacterSet: | Unicode |
| Comments: | Telegram Desktop |
| CompanyName: | Telegram FZ-LLC |
| FileDescription: | |
| FileVersion: | 2.1.10.0 |
| InternalName: | 0.exe |
| LegalCopyright: | Copyright (C) 2014-2020 |
| OriginalFileName: | 0.exe |
| ProductName: | Telegram Desktop |
| ProductVersion: | 2.1.10.0 |
| AssemblyVersion: | 0.0.0.0 |
Summary
| Architecture: | IMAGE_FILE_MACHINE_I386 |
|---|---|
| Subsystem: | IMAGE_SUBSYSTEM_WINDOWS_GUI |
| Compilation Date: | 20-Jun-2020 07:49:12 |
| Comments: | Telegram Desktop |
| CompanyName: | Telegram FZ-LLC |
| FileDescription: | - |
| FileVersion: | 2.1.10.0 |
| InternalName: | 0.exe |
| LegalCopyright: | Copyright (C) 2014-2020 |
| OriginalFilename: | 0.exe |
| ProductName: | Telegram Desktop |
| ProductVersion: | 2.1.10.0 |
| Assembly Version: | 0.0.0.0 |
DOS Header
| Magic number: | MZ |
|---|---|
| Bytes on last page of file: | 0x0090 |
| Pages in file: | 0x0003 |
| Relocations: | 0x0000 |
| Size of header: | 0x0004 |
| Min extra paragraphs: | 0x0000 |
| Max extra paragraphs: | 0xFFFF |
| Initial SS value: | 0x0000 |
| Initial SP value: | 0x00B8 |
| Checksum: | 0x0000 |
| Initial IP value: | 0x0000 |
| Initial CS value: | 0x0000 |
| Overlay number: | 0x0000 |
| OEM identifier: | 0x0000 |
| OEM information: | 0x0000 |
| Address of NE header: | 0x00000080 |
PE Headers
| Signature: | PE |
|---|---|
| Machine: | IMAGE_FILE_MACHINE_I386 |
| Number of sections: | 3 |
| Time date stamp: | 20-Jun-2020 07:49:12 |
| Pointer to Symbol Table: | 0x00000000 |
| Number of symbols: | 0 |
| Size of Optional Header: | 0x00E0 |
| Characteristics: |
|
Sections
Name | Virtual Address | Virtual Size | Raw Size | Charateristics | Entropy |
|---|---|---|---|---|---|
.text | 0x00002000 | 0x0000E7B4 | 0x0000E800 | IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ | 7.83076 |
.rsrc | 0x00012000 | 0x000005AA | 0x00000600 | IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ | 4.11477 |
.reloc | 0x00014000 | 0x0000000C | 0x00000200 | IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ | 0.0815394 |
Resources
Title | Entropy | Size | Codepage | Language | Type |
|---|---|---|---|---|---|
1 | 5.00112 | 490 | UNKNOWN | UNKNOWN | RT_MANIFEST |
Imports
mscoree.dll |
Total processes
42
Monitored processes
5
Malicious processes
4
Suspicious processes
0
Behavior graph
Click at the process to see the details
Process information
PID | CMD | Path | Indicators | Parent process | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 256 | "C:\Users\admin\AppData\Roaming\csrss.exe" | C:\Users\admin\AppData\Roaming\csrss.exe | — | csrss.exe | |||||||||||
User: admin Company: Telegram FZ-LLC Integrity Level: MEDIUM Description: Exit code: 0 Version: 2.1.10.0 Modules
| |||||||||||||||
| 996 | netsh firewall add allowedprogram "C:\Users\admin\AppData\Roaming\csrss.exe" "csrss.exe" ENABLE | C:\Windows\system32\netsh.exe | — | csrss.exe | |||||||||||
User: admin Company: Microsoft Corporation Integrity Level: MEDIUM Description: Network Command Shell Exit code: 1 Version: 6.1.7600.16385 (win7_rtm.090713-1255) Modules
| |||||||||||||||
| 2060 | "C:\Users\admin\AppData\Local\Temp\csrss.exe" | C:\Users\admin\AppData\Local\Temp\csrss.exe | csrss.exe | ||||||||||||
User: admin Company: Telegram FZ-LLC Integrity Level: MEDIUM Description: Exit code: 0 Version: 2.1.10.0 Modules
| |||||||||||||||
| 2436 | "C:\Users\admin\AppData\Local\Temp\csrss.exe" | C:\Users\admin\AppData\Local\Temp\csrss.exe | — | explorer.exe | |||||||||||
User: admin Company: Telegram FZ-LLC Integrity Level: MEDIUM Description: Exit code: 0 Version: 2.1.10.0 Modules
| |||||||||||||||
| 3568 | "C:\Users\admin\AppData\Roaming\csrss.exe" | C:\Users\admin\AppData\Roaming\csrss.exe | csrss.exe | ||||||||||||
User: admin Company: Telegram FZ-LLC Integrity Level: MEDIUM Description: Exit code: 0 Version: 2.1.10.0 Modules
| |||||||||||||||
Total events
507
Read events
392
Write events
115
Delete events
0
Modification events
| (PID) Process: | (2060) csrss.exe | Key: | HKEY_CURRENT_USER |
| Operation: | write | Name: | di |
Value: ! | |||
| (PID) Process: | (2060) csrss.exe | Key: | HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap |
| Operation: | write | Name: | UNCAsIntranet |
Value: 0 | |||
| (PID) Process: | (2060) csrss.exe | Key: | HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap |
| Operation: | write | Name: | AutoDetect |
Value: 1 | |||
| (PID) Process: | (3568) csrss.exe | Key: | HKEY_CURRENT_USER |
| Operation: | write | Name: | di |
Value: ! | |||
| (PID) Process: | (3568) csrss.exe | Key: | HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run |
| Operation: | write | Name: | ec9b63473574886ab941f45aa108e21b |
Value: "C:\Users\admin\AppData\Roaming\csrss.exe" .. | |||
| (PID) Process: | (996) netsh.exe | Key: | HKEY_CLASSES_ROOT\Local Settings\MuiCache\13C\52C64B7E |
| Operation: | write | Name: | LanguageList |
Value: en-US | |||
| (PID) Process: | (996) netsh.exe | Key: | HKEY_CLASSES_ROOT\Local Settings\MuiCache\13C\52C64B7E |
| Operation: | write | Name: | @%SystemRoot%\system32\p2pcollab.dll,-8042 |
Value: Peer to Peer Trust | |||
| (PID) Process: | (996) netsh.exe | Key: | HKEY_CLASSES_ROOT\Local Settings\MuiCache\13C\52C64B7E |
| Operation: | write | Name: | @%SystemRoot%\system32\qagentrt.dll,-10 |
Value: System Health Authentication | |||
| (PID) Process: | (996) netsh.exe | Key: | HKEY_CLASSES_ROOT\Local Settings\MuiCache\13C\52C64B7E |
| Operation: | write | Name: | @%SystemRoot%\system32\dnsapi.dll,-103 |
Value: Domain Name System (DNS) Server Trust | |||
| (PID) Process: | (996) netsh.exe | Key: | HKEY_CLASSES_ROOT\Local Settings\MuiCache\13C\52C64B7E |
| Operation: | write | Name: | @%SystemRoot%\System32\fveui.dll,-843 |
Value: BitLocker Drive Encryption | |||
Executable files
2
Suspicious files
0
Text files
0
Unknown types
0
Dropped files
PID | Process | Filename | Type | |
|---|---|---|---|---|
| 3568 | csrss.exe | C:\Users\admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ec9b63473574886ab941f45aa108e21b.exe | executable | |
MD5:— | SHA256:— | |||
| 2060 | csrss.exe | C:\Users\admin\AppData\Roaming\csrss.exe | executable | |
MD5:— | SHA256:— | |||
Download PCAP, analyze network streams, HTTP content and a lot more at the full report
HTTP(S) requests
0
TCP/UDP connections
1
DNS requests
1
Threats
7
HTTP requests
Download PCAP, analyze network streams, HTTP content and a lot more at the full report
Connections
PID | Process | IP | Domain | ASN | CN | Reputation |
|---|---|---|---|---|---|---|
3568 | csrss.exe | 211.114.249.146:1111 | disco159.kro.kr | Korea Telecom | KR | malicious |
DNS requests
Domain | IP | Reputation |
|---|---|---|
disco159.kro.kr |
| malicious |
Threats
PID | Process | Class | Message |
|---|---|---|---|
3568 | csrss.exe | A Network Trojan was detected | ET TROJAN Bladabindi/njRAT CnC Command (ll) |
3568 | csrss.exe | A Network Trojan was detected | MALWARE [PTsecurity] njRAT/Bladabindi |
3568 | csrss.exe | A Network Trojan was detected | MALWARE [PTsecurity] njRAT.Gen RAT outbound connection |
4 ETPRO signatures available at the full report