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

Static analysis result for SHA-256 c8caaf6fe48e4472…

MALICIOUS

Office (OLE) / .XLS

58.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-09
MD5: 7f132e78dfd317db59aac7a98dfcb9c0 SHA-1: 3034addd6ff14917c329d3218fb0ca7699b2c4f4 SHA-256: c8caaf6fe48e44729e14263ff78281e98af7d39cd069dd3186b08d38fccc5da0
148 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing a malicious Equation Editor OLE object. This object exploits CVE-2017-11882, a known vulnerability that allows for arbitrary code execution. The VBA project itself contains no executable statements, indicating the exploit is solely within the embedded OLE object. The primary IOC is the file's SHA256 hash.

Heuristics 4

  • 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.
  • x86 GetPC stub (CALL $+5; POP EDI) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EDI)
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
e567a07cbc7a319091f6e3906d5bad7e013a495a6b0d4ffc86c2ede9588607e0		 ole-package OLE Ole10Native stream: MBD00027AFF/Ole10native 1884 bytes

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