Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 141a30aa6dd44d3c…

MALICIOUS

Office (OLE)

157.0 KB Created: 2019-11-25 16:08:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: ef5164b44ae088bafce8881769d35a18 SHA-1: 1a8acec3e42a617ae1495dfabde269b5c8d236f3 SHA-256: 141a30aa6dd44d3cd88f8a0a515ce1dbe645e6f93609be60a4588cde685af33f
324 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The macros utilize `GetObject` and `CreateObject` to interact with WMI, specifically launching `Win32_Process` to execute commands. This is a common technique for downloading and executing further malicious payloads. The ClamAV detection name 'Xls.Downloader.Sload-9786292-0' also suggests a downloader functionality.

Heuristics 10

  • ClamAV: Xls.Downloader.Sload-9786292-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Sload-9786292-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)
    • https://www.maxmind.com/geoip/v2.1/city/me�In document text (OLE body)
    • https://www.maxmind.com/en/locate-my-ip-addressIn document text (OLE body)
    • https://www.maxmind.com/geoip/v2.1/city/meIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 131008 bytes
SHA-256: 61d1e7753e28a29d5921e702938ca4b18762e12d7a328239996a9773a3f1b281
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "Module1"
Private Const CP_UTF8                       As Long = 65001

#If Win64 Then
Private Declare PtrSafe Function WideCharToMultiByte Lib "kernel32" (ByVal CodePage As LongPtr, ByVal dwFlags As LongPtr, ByVal lpWideCharStr As LongPtr, ByVal cchWideChar As LongPtr, lpMultiByteStr As Any, ByVal cchMultiByte As LongPtr, ByVal lpDefaultChar As LongPtr, ByVal lpUsedDefaultChar As LongPtr) As LongPtr
Private Declare PtrSafe Function MultiByteToWideChar Lib "kernel32" (ByVal CodePage As LongPtr, ByVal dwFlags As LongPtr, lpMultiByteStr As Any, ByVal cchMultiByte As LongPtr, ByVal lpWideCharStr As LongPtr, ByVal cchWideChar As LongPtr) As Long
#Else
Private Declare Function WideCharToMultiByte Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long, lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpDefaultChar As Long, ByVal lpUsedDefaultChar As Long) As Long
Private Declare Function MultiByteToWideChar Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long) As Long

#End If



Sub HW_AllStocksAnalysis()
    yearValue = InputBox("What year would you like to run the analysis on?")

    Worksheets("Challenge_All Stocks Anlysis").Activate
    Range("A1").Value = "All Stocks (" + yearValue + ")"
    'Create a header row
    Cells(3, 1).Value = "Ticker"
    Cells(3, 2).Value = "Total Daily Volume"
    Cells(3, 3).Value = "Return"
    
    'declare 4 arrays
    Dim tickers(12) As String
    Dim volume(12) As String
    Dim startingPrices(12) As String
    Dim endingPrices(12) As String
    'create index variable
    Dim tickerIndex As Integer

    Worksheets(yearValue).Activate
    RowCount = Cells(Rows.Count, "A").End(xlUp).Row

    '(1)the outer loop for index from 0 to 11
    tickerIndex = 0
    
    Worksheets(yearValue).Activate
    For tickerIndex = 0 To 11
        '(2)the main loop for stock data
        Worksheets(yearValue).Activate
        For j = 2 To RowCount
            'retrieve ticker name and start price for each tickerIndex and store them in arrays
            If Cells(j, 1).Value <> Cells(j - 1, 1).Value Then
                tickers(tickerIndex) = Cells(j, 1).Value
                startingPrices(tickerIndex) = Cells(j, 6).Value
            End If
                '(3)a nested loop for retrieving TotalVolume for each volume array
                Worksheets(yearValue).Activate
                    TotalVolume = 0
                    For x = 2 To RowCount
                        If Cells(x, 1).Value = tickers(tickerIndex) Then
                            TotalVolume = TotalVolume + Cells(x, 8).Value
                        End If
                    Next x

                    volume(tickerIndex) = TotalVolume
            
            'retrieve and store ending price in array as well as increment tickerIndex for next loop
            If Cells(j + 1, 1).Value <> Cells(j, 1).Value Then
                endingPrices(tickerIndex) = Cells(j, 6).Value
                tickerIndex = tickerIndex + 1
            End If
        Next j
        
    Next tickerIndex
    
    '(4)store all informations collected in a output worksheet
    Worksheets("Challenge_All Stocks Anlysis").Activate
    For i = 0 To 11
        
        Cells(i + 4, 1).Value = tickers(i)
        Cells(i + 4, 3).Value = endingPrices(i) / startingPrices(i) - 1
        Cells(4 + i, 2).Value = volume(i)
    
    Next i
                
    'formatting
    Worksheets("Challenge_All Stocks Anlysis").Activate
        Range("A3:C3").Font.Bold = True
        Range("A1").Font.FontStyle = "Bold"
        Range
... (truncated)

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