Report - winlog.exe

AsyncRAT backdoor
ScreenShot
Created 2021.04.20 09:40 Machine s1_win7_x6401
Filename winlog.exe
Type PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows
AI Score
8
Behavior Score
14.4
ZERO API file : malware
VT API (file) 23 detected (malicious, high confidence, Artemis, Kryptik, Eldorado, Attribute, HighConfidence, AANJ, Noon, RATX, kcloud, PrimaryPass, score, ZemsilF, Ym0@aGyQ93m, Unsafe, Static AI, Malicious PE, confidence)
md5 e0510b1d4dae20508467f238ba1e338e
sha256 12c9ee4c7c5172b82a032aedc3884f580f07e96b9b48c3c3e0fb9dfbbbdf79e0
ssdeep 12288:r3M6e0WKxI3/sBrlxHqlLqUNkniC9bM8nu2Vu23MWx3gNRyzRRRRR0Z7k2N:r3FZWKmWTqlFkVxnu2InY3gGRRRRRGx
imphash f34d5f2d4577ed6d9ceec516c1f5a744
impfuzzy 3:rGsLdAIEK:tf
  Network IP location

Signature (31cnts)

Level Description
danger Executed a process and injected code into it
warning File has been identified by 23 AntiVirus engines on VirusTotal as malicious
watch A process attempted to delay the analysis task.
watch Allocates execute permission to another process indicative of possible code injection
watch Code injection by writing an executable or DLL to the memory of another process
watch Communicates with host for which no DNS query was performed
watch Harvests credentials from local email clients
watch Harvests credentials from local FTP client softwares
watch Harvests information related to installed instant messenger clients
watch Potential code injection by writing to the memory of another process
watch Putty Files
watch Resumed a suspended thread in a remote process potentially indicative of process injection
watch Used NtSetContextThread to modify a thread in a remote process indicative of process injection
notice Allocates read-write-execute memory (usually to unpack itself)
notice Checks for the Locally Unique Identifier on the system for a suspicious privilege
notice HTTP traffic contains suspicious features which may be indicative of malware related traffic
notice Moves the original executable to a new location
notice One or more potentially interesting buffers were extracted
notice Performs some HTTP requests
notice Potentially malicious URLs were found in the process memory dump
notice Sends data using the HTTP POST Method
notice Starts servers listening
notice Steals private information from local Internet browsers
notice The binary likely contains encrypted or compressed data indicative of a packer
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 Queries for the computername
info Tries to locate where the browsers are installed
info Uses Windows APIs to generate a cryptographic key

Rules (21cnts)

Level Name Description Collection
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 IsPE32 (no description) binaries (upload)
info PE_Header_Zero PE File Signature Zero binaries (upload)
info SEH__vectored (no description) memory
info ThreadControl__Context (no description) memory
info IsNET_EXE (no description) binaries (upload)
info IsPacked Entropy Check binaries (upload)
info IsWindowsGUI (no description) binaries (upload)
info network_dns Communications use DNS memory
info network_tcp_listen Listen for incoming communication memory
info network_tcp_socket Communications over RAW socket memory
info Str_Win32_Winsock2_Library Match Winsock 2 API library declaration memory
info Win_Backdoor_AsyncRAT_Zero Win Backdoor AsyncRAT binaries (upload)
info win_files_operation Affect private profile memory
info win_private_profile Affect private profile binaries (upload)
info win_private_profile Affect private profile memory

Network (4cnts) ?

Request CC ASN Co IP4 Rule ? ZERO ?
http://bncoporations.tk/Bn2/fre.php US CLOUDFLARENET 172.67.185.63 clean
bncoporations.tk US CLOUDFLARENET 172.67.185.63 clean
172.67.188.154 US CLOUDFLARENET 172.67.188.154 clean
172.67.185.63 US CLOUDFLARENET 172.67.185.63 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