Office (OLE) / .XLS malware analysis — malicious · 33bc523a84a9533c

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-03

MD5: f29207f8b1ff508cbe6c3ccfa798002f SHA-1: 362c7f850f3254667ee3e00276c6b09677cc4276 SHA-256: 33bc523a84a9533c5dae0ce1757dcfbfe3b88d1ba25f998a4826c373173ca684

148 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. The presence of an OLE object containing this payload strongly suggests the document is designed to exploit this vulnerability upon opening. No VBA macros were found to be executable, and the document body was unreadable, but the Equation Editor exploit is sufficient for malicious execution.

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 ECX) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP ECX)
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.

Filename	Kind	Source	Size
`macros.bas` `7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1206 bytes
`ole10native_00.bin` `ba95a1fcdd7699d987661c7ad54516d78eef3620e11328d1a8b257d3e4022369`	ole-package	OLE Ole10Native stream: MBD0048592A/olE10naTive	1161 bytes

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