Office (OLE) / .XLS malware analysis — malicious · 7f4e4df0b70e7b03

MALICIOUS

Office (OLE) / .XLS

750.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-22

MD5: 22f9d973e6941fd34c0670e211ed71f6 SHA-1: 69e9ca3176c7aec17f933fd2956d81256fa431ce SHA-256: 7f4e4df0b70e7b0343b4f1abd2d8047b3ffe5caae0323dd937f16fc92c1c553b

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1059.005 Visual Basic

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates the file contains a payload exploiting this specific vulnerability. The presence of an OLE Equation Editor object further supports this. While no VBA macros were found to contain executable statements, the exploit itself is the primary mechanism for payload delivery. The file's purpose is to leverage this exploit to execute a secondary payload.

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 EBP) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EBP)
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` `1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2412 bytes
`ole10native_00.bin` `a6a86927fb51f8e05174b647eff003451f9a550ca74daf81c7ed7b1e2b8c41af`	ole-package	OLE Ole10Native stream: MBD01FFC61F/Ole10Native	1356 bytes

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