Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 63c37f9afe5f7178…

MALICIOUS

Office (OLE)

179.2 KB Authoring application: Microsoft Excel First seen: 2012-06-30
MD5: ac227679a42e36364a627cd2dda4b73e SHA-1: a03134fa76a8a49c75ec3476f94e467afc5f548f SHA-256: 63c37f9afe5f717885679ec56c7737b0ad810573329cd7749e0f1f1e21e5ae9e
82 Risk Score

Heuristics 3

  • XOR-encoded strings (key 0xDE) critical SC_XOR_ENCODED
    Found 5 Windows library/API name(s) XOR-encoded with single-byte key 0xDE: 'GetProcAddress', 'CreateProcessA', 'ExitProcess', 'CreateFileA', 'CreateFileW'
    Disassembly hidden — these bytes score as data, not coherent x86 code (no internal branches to corroborate control flow).
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 606 bytes
SHA-256: 481031c20227961d1e7d207d0bb17c79a9001efbdb37ac509a4ff93acb047bf0
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

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