Report - Four.exe

Azorult .NET framework Gen1 AsyncRAT backdoor
ScreenShot
Created 2021.04.09 11:38 Machine s1_win7_x6401
Filename Four.exe
Type PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows
AI Score
7
Behavior Score
9.4
ZERO API file : malware
VT API (file) 36 detected (GenericKD, Bsymem, HgIASSUA, Unsafe, cobra, Wacatac, malicious, ZemsilF, gm0@aGFWxRp, Attribute, HighConfidence, CsdiMonetize, FileRepMalware, UnclassifiedMalware@0, Artemis, Generic PUA JG, ai score=98, kcloud, CIAR07, score, CLOUD, confidence)
md5 a5e1b2c81a61f141540e2e4d14c1e4de
sha256 5788de5efeb9850b6fdea52dbe26a4aa9fa28dfbfd56280b4533226157d1c9a5
ssdeep 3072:9l8/iMBQYp4SbwzDC2aJDeEsXcXPBQA6S4QF:PAL7wzsDeEssXPBQA6O
imphash f34d5f2d4577ed6d9ceec516c1f5a744
impfuzzy 3:rGsLdAIEK:tf
  Network IP location

Signature (23cnts)

Level Description
danger File has been identified by 36 AntiVirus engines on VirusTotal as malicious
watch Communicates with host for which no DNS query was performed
watch One or more of the buffers contains an embedded PE file
watch Resumed a suspended thread in a remote process potentially indicative of process injection
notice Allocates read-write-execute memory (usually to unpack itself)
notice An application raised an exception which may be indicative of an exploit crash
notice Changes read-write memory protection to read-execute (probably to avoid detection when setting all RWX flags at the same time)
notice Checks adapter addresses which can be used to detect virtual network interfaces
notice Creates executable files on the filesystem
notice Drops a binary and executes it
notice Drops an executable to the user AppData folder
notice HTTP traffic contains suspicious features which may be indicative of malware related traffic
notice One or more potentially interesting buffers were extracted
notice Performs some HTTP requests
notice Queries the disk size which could be used to detect virtual machine with small fixed size or dynamic allocation
notice Searches running processes potentially to identify processes for sandbox evasion
notice Uses Windows utilities for basic Windows functionality
notice Yara rule detected in process memory
info Checks amount of memory in system
info Checks if process is being debugged by a debugger
info Collects information to fingerprint the system (MachineGuid
info One or more processes crashed
info Queries for the computername

Rules (56cnts)

Level Name Description Collection
danger Win32_Trojan_Gen_1_0904B0_Zero Win32 Trojan Emotet binaries (download)
notice Str_Win32_Http_API Match Windows Http API call binaries (download)
notice Str_Win32_Internet_API Match Windows Inet API call binaries (download)
info anti_dbg Checks if being debugged memory
info DebuggerCheck__GlobalFlags (no description) memory
info DebuggerCheck__QueryInfo (no description) memory
info DebuggerHiding__Active (no description) memory
info DebuggerHiding__Thread (no description) memory
info disable_dep Bypass DEP memory
info IsDLL (no description) binaries (download)
info IsPE32 (no description) binaries (download)
info IsPE32 (no description) binaries (upload)
info IsPE64 (no description) binaries (download)
info JPEG_Format_Zero JPEG Format binaries (download)
info OS_Processor_Check_Zero OS Processor Check Signature Zero binaries (download)
info PE_Header_Zero PE File Signature Zero binaries (download)
info PE_Header_Zero PE File Signature Zero binaries (upload)
info PNG_Format_Zero PNG Format binaries (download)
info SEH__vectored (no description) memory
info ThreadControl__Context (no description) memory
info borland_delphi Borland Delphi 2.0 - 7.0 / 2005 - 2007 binaries (download)
info borland_delphi_dll Borland Delphi DLL binaries (download)
info escalate_priv Escalade priviledges binaries (download)
info HasDebugData DebugData Check binaries (download)
info HasDigitalSignature DigitalSignature Check binaries (download)
info HasOverlay Overlay Check binaries (download)
info HasRichSignature Rich Signature Check binaries (download)
info IsConsole (no description) binaries (download)
info IsNET_EXE (no description) binaries (download)
info IsNET_EXE (no description) binaries (upload)
info IsPacked Entropy Check binaries (download)
info IsWindowsGUI (no description) binaries (download)
info IsWindowsGUI (no description) binaries (upload)
info keylogger Run a keylogger binaries (download)
info Microsoft_Office_Document_Zero Microsoft Office Document Signature Zero binaries (download)
info network_dns Communications use DNS binaries (download)
info network_ftp Communications over FTP binaries (download)
info network_http Communications over HTTP binaries (download)
info network_tcp_listen Listen for incoming communication binaries (download)
info network_tcp_socket Communications over RAW socket binaries (download)
info network_udp_sock Communications over UDP network binaries (download)
info screenshot Take screenshot binaries (download)
info spreading_file Malware can spread east-west file binaries (download)
info Str_Win32_Wininet_Library Match Windows Inet API library declaration binaries (download)
info Str_Win32_Winsock2_Library Match Winsock 2 API library declaration binaries (download)
info Win32_Trojan_PWS_Azorult_Net_1_Zero Win32 Trojan PWS .NET Azorult binaries (upload)
info Win_Backdoor_AsyncRAT_Zero Win Backdoor AsyncRAT binaries (download)
info Win_Backdoor_AsyncRAT_Zero Win Backdoor AsyncRAT binaries (upload)
info win_files_operation Affect private profile binaries (download)
info win_files_operation Affect private profile memory
info win_mutex Create or check mutex binaries (download)
info win_private_profile Affect private profile binaries (download)
info win_registry Affect system registries binaries (download)
info win_registry Affect system registries memory
info win_token Affect system token binaries (download)
info win_token Affect system token memory

Network (9cnts) ?

Request CC ASN Co IP4 Rule ? ZERO ?
http://greataccesstoserver.com/files/ScHost.exe DE DIGITALOCEAN-ASN 159.89.4.33 malware
http://greataccesstoserver.com/files/ScHost.exe.config DE DIGITALOCEAN-ASN 159.89.4.33 clean
https://digitalassets.ams3.digitaloceanspaces.com/cstadmo/setups.exe NL DIGITALOCEAN-ASN 5.101.110.225 clean
digitalassets.ams3.digitaloceanspaces.com NL DIGITALOCEAN-ASN 5.101.110.225 malware
greataccesstoserver.com DE DIGITALOCEAN-ASN 159.89.4.33 malware
catser.inappapiurl.com US DIGITALOCEAN-ASN 138.197.53.157 clean
159.89.4.33 DE DIGITALOCEAN-ASN 159.89.4.33 malware
5.101.110.225 NL DIGITALOCEAN-ASN 5.101.110.225 malware
138.197.53.157 US DIGITALOCEAN-ASN 138.197.53.157 clean

Suricata ids

PE API

IAT(Import Address Table) Library

mscoree.dll
 0x402000 _CorExeMain

EAT(Export Address Table) is none



Similarity measure (PE file only) - Checking for service failure