Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 8886deeb1f13a0c2…

MALICIOUS

Office (OLE) / .XLS

677.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-03-27
MD5: 3d26dd05a31971a6c0ddf741fa99fbe4 SHA-1: 3a99384b64c2c8bde55e145b42c7f4dcb3d91d35 SHA-256: 8886deeb1f13a0c21d14ab2db36d984b7af51c6c9e5608d65aac5ac7aba2da49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The file is a Microsoft Excel spreadsheet containing an embedded Equation Editor object that exploits CVE-2017-11882. This exploit is designed to download and execute a second-stage payload from the URLs http://107.172.135.4/httpswww.bigrock.inutm_source=hgi&utm_medium=referral&campaign=migration.php or http://015353103404/httpswww.bigrock.inutm_source=hgi&utm_medium=referral&campaign=migration.php, saving it as %APPDATA%\／----------________.hTa. No VBA macros were found to be executable, but the Equation Editor exploit itself is sufficient for initial execution.

Heuristics 5

  • Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • Equation Editor shellcode downloads a second-stage payload critical OLE_MTEF_SHELLCODE_DOWNLOAD_URL
    The shellcode reached by the Equation Editor overflow resolves download/exec APIs and fetches a second-stage payload. The URL was recovered by emulating the shellcode's self-decoding stub; an integer-encoded host (e.g. http://000030000706151) is normalised to its dotted-quad form and both spellings are surfaced.
  • VBA project contains no executable statements info OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • 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://107.172.135.4/httpswww.bigrock.inutm_source=hgi&utm_medium=referral&utm_campaign=migration.php In document text (OLE body)
    • http://015353103404/httpswww.bigrock.inutm_source=hgi&utm_medium=referral&utm_campaign=migration.phpIn document text (OLE body)
    • http://000030000706151In document text (OLE body)
    • http://192.3.140.105Decoded from obfuscated IP host (000030000706151)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
SHA-256: 7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673
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

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 = "Sheet2"
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 = "Sheet3"
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
ole10native_00.bin ole-package OLE Ole10Native stream: MBD0024AC42/olE10NAtiVe 1782 bytes
SHA-256: 514d829496ec03c3877e5d0fab84505e5075303889103d3128f8e34aaab3f4e2

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