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Report - stealc_valenciga.exe

Gen1 Generic Malware Malicious Library Admin Tool (Sysinternals etc ...) Antivirus UPX Malicious Packer PE File PE32 DLL OS Processor Check
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ScreenShot
Created 2024.08.01 08:45 Machine s1_win7_x6403
Filename stealc_valenciga.exe
Type PE32 executable (GUI) Intel 80386, for MS Windows
AI Score
8
 Behavior Score
7.2
ZERO API file : clean
VT API (file)
md5 cb24cc9c184d8416a66b78d9af3c06a2
sha256 53ebff6421eac84a4337bdf9f33d409ca84b5229ac9e001cd95b6878d8bdbeb6
ssdeep 3072:iJlgTFj5qDao8KaxfE54HnnGSail+bOX8b/aB9GVFHJKa:iJ65j5Ka2aOanGSabYZTOFpKa
imphash 75f38a281962eafd8c14d2b02cfcdab6
impfuzzy 24:j/8Wfb8J93qsQCTBlR1YzGWtU9fMyDkfjY/J3IQ:j/8Mb8r3qVCTBv1kGWtcfMzKj
  Network IP location

Signature (17cnts)

Level Description
watch Checks the CPU name from registry
watch Collects information about installed applications
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
notice Allocates read-write-execute memory (usually to unpack itself)
notice An executable file was downloaded by the process stealc_valenciga.exe
notice Creates executable files on the filesystem
notice HTTP traffic contains suspicious features which may be indicative of malware related traffic
notice Performs some HTTP requests
notice Queries for potentially installed applications
notice Searches running processes potentially to identify processes for sandbox evasion
notice Sends data using the HTTP POST Method
notice Steals private information from local Internet browsers
info Checks amount of memory in system
info Queries for the computername
info Tries to locate where the browsers are installed

Rules (16cnts)

Level Name Description Collection
danger Win32_Trojan_Gen_1_0904B0_Zero Win32 Trojan Emotet binaries (download)
warning Generic_Malware_Zero Generic Malware binaries (download)
warning Generic_Malware_Zero Generic Malware binaries (upload)
watch Admin_Tool_IN_Zero Admin Tool Sysinternals binaries (upload)
watch Antivirus Contains references to security software binaries (upload)
watch Malicious_Library_Zero Malicious_Library binaries (download)
watch Malicious_Library_Zero Malicious_Library binaries (upload)
watch Malicious_Packer_Zero Malicious Packer binaries (download)
watch UPX_Zero UPX packed file binaries (download)
watch UPX_Zero UPX packed file binaries (upload)
info IsDLL (no description) binaries (download)
info IsPE32 (no description) binaries (download)
info IsPE32 (no description) binaries (upload)
info OS_Processor_Check_Zero OS Processor Check binaries (download)
info PE_Header_Zero PE File Signature binaries (download)
info PE_Header_Zero PE File Signature binaries (upload)

Network (10cnts) ?

Request CC ASN Co IP4 Rule ? ZERO ?
http://185.215.113.17/f1ddeb6592c03206/msvcp140.dll
whois
Unknown 185.215.113.17 275 mailcious
http://185.215.113.17/2fb6c2cc8dce150a.php
whois
Unknown 185.215.113.17 275 mailcious
http://185.215.113.17/f1ddeb6592c03206/mozglue.dll
whois
Unknown 185.215.113.17 275 mailcious
http://185.215.113.17/f1ddeb6592c03206/sqlite3.dll
whois
Unknown 185.215.113.17 275 mailcious
http://185.215.113.17/f1ddeb6592c03206/softokn3.dll
whois
Unknown 185.215.113.17 275 mailcious
http://185.215.113.17/
whois
Unknown 185.215.113.17 275 mailcious
http://185.215.113.17/f1ddeb6592c03206/nss3.dll
whois
Unknown 185.215.113.17 275 mailcious
http://185.215.113.17/f1ddeb6592c03206/vcruntime140.dll
whois
Unknown 185.215.113.17 275 mailcious
http://185.215.113.17/f1ddeb6592c03206/freebl3.dll
whois
Unknown 185.215.113.17 275 mailcious
185.215.113.17
whois
Unknown 185.215.113.17 malware

Suricata ids

ET DROP Spamhaus DROP Listed Traffic Inbound group 33
ET MALWARE [SEKOIA.IO] Win32/Stealc C2 Check-in
ET MALWARE Win32/Stealc Requesting browsers Config from C2
ET MALWARE Win32/Stealc Active C2 Responding with browsers Config M1
ET MALWARE Win32/Stealc Requesting plugins Config from C2
ET MALWARE Win32/Stealc/Vidar Stealer Active C2 Responding with plugins Config M1
ET INFO Dotted Quad Host DLL Request
ET HUNTING HTTP GET Request for freebl3.dll - Possible Infostealer Activity
ET POLICY PE EXE or DLL Windows file download HTTP
ET INFO Executable Retrieved With Minimal HTTP Headers - Potential Second Stage Download
ET MALWARE Win32/Stealc Submitting System Information to C2
ET HUNTING HTTP GET Request for sqlite3.dll - Possible Infostealer Activity
ET HUNTING HTTP GET Request for mozglue.dll - Possible Infostealer Activity
ET HUNTING HTTP GET Request for nss3.dll - Possible Infostealer Activity
ET HUNTING HTTP GET Request for softokn3.dll - Possible Infostealer Activity
ET HUNTING HTTP GET Request for vcruntime140.dll - Possible Infostealer Activity

PE API

IAT(Import Address Table) Library

msvcrt.dll
 0x41e0ac strncpy
 0x41e0b0 ??_V@YAXPAX@Z
 0x41e0b4 memchr
 0x41e0b8 ??_U@YAPAXI@Z
 0x41e0bc strtok
 0x41e0c0 strtok_s
 0x41e0c4 strcpy_s
 0x41e0c8 vsprintf_s
 0x41e0cc memmove
 0x41e0d0 strlen
 0x41e0d4 malloc
 0x41e0d8 free
 0x41e0dc memcmp
 0x41e0e0 ??2@YAPAXI@Z
 0x41e0e4 memset
 0x41e0e8 memcpy
 0x41e0ec __CxxFrameHandler3
KERNEL32.dll
 0x41e000 InitializeCriticalSectionAndSpinCount
 0x41e004 WideCharToMultiByte
 0x41e008 RaiseException
 0x41e00c GetStringTypeW
 0x41e010 MultiByteToWideChar
 0x41e014 LCMapStringW
 0x41e018 IsValidCodePage
 0x41e01c lstrlenA
 0x41e020 HeapAlloc
 0x41e024 GetProcessHeap
 0x41e028 VirtualProtect
 0x41e02c VirtualQueryEx
 0x41e030 OpenProcess
 0x41e034 ReadProcessMemory
 0x41e038 WriteFile
 0x41e03c GetOEMCP
 0x41e040 GetACP
 0x41e044 UnhandledExceptionFilter
 0x41e048 SetUnhandledExceptionFilter
 0x41e04c IsDebuggerPresent
 0x41e050 EncodePointer
 0x41e054 DecodePointer
 0x41e058 TerminateProcess
 0x41e05c GetCurrentProcess
 0x41e060 LeaveCriticalSection
 0x41e064 EnterCriticalSection
 0x41e068 RtlUnwind
 0x41e06c GetProcAddress
 0x41e070 GetModuleHandleW
 0x41e074 ExitProcess
 0x41e078 Sleep
 0x41e07c GetStdHandle
 0x41e080 GetModuleFileNameW
 0x41e084 GetLastError
 0x41e088 LoadLibraryW
 0x41e08c TlsGetValue
 0x41e090 TlsSetValue
 0x41e094 InterlockedIncrement
 0x41e098 SetLastError
 0x41e09c GetCurrentThreadId
 0x41e0a0 InterlockedDecrement
 0x41e0a4 GetCPInfo

EAT(Export Address Table) is none


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