Office (OLE) / .XLSX malware analysis — malicious · 21326134c705a11e

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 15cbbd222b046bca1e46fa9c363fbfc4 SHA-1: 4d793f5b4abb13fb953150d93f2fa5b9712f5127 SHA-256: 21326134c705a11e11a09840fa3473a36f43ca7ac8f8b85bf6f40233914cd615

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The sample contains VBA macros that execute upon opening the workbook, as indicated by the Workbook_Open heuristic. The script leverages `CreateObject("Wscript.Shell")` to execute a batch file located at `c:\programdata\jledshf.bat`. This batch file appears to be constructed from concatenated strings, with the reconstructed URL being `http://aiShyAnna.com/wp-admin/6pY01tdOxYb10/`. The script also attempts to execute a second stage payload using `rundll32.exe`. The ClamAV detection `Doc.Downloader.EmotetExcel02226-9938630-0` further supports its malicious nature as a downloader.

Heuristics 7

ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c49f2df77c50e10269216d97c3efdf7c32f9f18ba5d8fd42a9b144f48e100040`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	5709 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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