Office (OLE) malware analysis — malicious · 89d2b33d216f4871

MALICIOUS

Office (OLE)

352.0 KB Created: 1999-04-13 20:07:00 Authoring application: Microsoft Word 8.0 First seen: 2015-08-19

MD5: a68b99c471dd74c95c242adac3d6ad12 SHA-1: 4d2d2a5bcacd81ff1af6c697022db64a21030539 SHA-256: 89d2b33d216f487122cfc647404128843b26f90eb10b31580e00dabd2207cacc

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This Office document contains an embedded PE executable (i.exe) which is flagged as a critical finding. The document also references WinExec and VirtualAlloc APIs, suggesting the execution of external code. The embedded executable is likely a secondary payload dropped by the document, indicating a malicious dropper functionality.

Heuristics 5

ClamAV: Doc.Dropper.Agent-6586737-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6586737-0
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
Ole10Native package drops an auto-executable payload critical OFFICE_PACKAGE_RISKY_FILE

OLE Package displayName or fullPath ends in a directly auto-executable extension (a runnable binary or a script the default shell host runs on double-click). Embedding such a payload inside an Office document has no benign authoring use — it is a malware-delivery dropper.
Reference to WinExec API high SC_STR_WINEXEC

Reference to WinExec API
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_0004262e.exe`	embedded-pe	Office MZ+PE at offset 0x4262E	88530 bytes
SHA-256: `79a92ce1c055fc6d65eb9175208a32b80615062d3cd0dce76e6d397a8658479e`
`ole10native_00.bin`	ole-package	OLE Ole10Native stream: ObjectPool/_983547946/Ole10Native	41572 bytes
SHA-256: `f73fab84adc922b6ff9eed356986d3e143c0e76353c042aeb7c6470cd7a8b2f3`

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