Office (OLE) / .XLSX malware analysis — malicious · 8b8ec7ee7711c088

MALICIOUS

Office (OLE) / .XLSX

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

MD5: f5e70b8db1b9e3681fa821bbeb11a469 SHA-1: d040f56f0b9b6372e0fec4dcde58c0757c1326df SHA-256: 8b8ec7ee7711c088f700d9dfe62f91ddd76732e6da1f43ab1a6a778c4412fe2a

280 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains VBA macros that trigger on workbook open, indicative of malicious intent. The macros utilize `CreateObject` to instantiate `Wscript.Shell`, which is then used to execute commands. The document body and script content reveal attempts to download and execute payloads from multiple URLs, including reconstructed URLs like 'http://santoertillala.com/_baks/tUX9/'. The presence of `c:\programdata\yhjlswle.vbs` and `c:\programdata\ughldskbhn.bat` suggests the creation of malicious files on the system for execution. The ClamAV detection further confirms its malicious nature as a downloader.

Heuristics 7

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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` `7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12808 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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