Office (OLE) / .XLS malware analysis — malicious · 87b08adafd224606

MALICIOUS

Office (OLE) / .XLS

170.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel

MD5: 8319bf09a48f2b8adeaa22ecac73996d SHA-1: 13df638d75427b37ff7f049cfa4f38fe82a8e7e7 SHA-256: 87b08adafd2246067a02148e96965a0e1d754d5f43805007b7a9210ad4aa937f

370 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Excel file contains a Workbook_Open VBA macro that utilizes WScript.Shell and CreateObject to download a file using HTTP and save it to disk. The script attempts to save the downloaded file to the user's profile directory, specifically constructing the path 'USERPROFILE\fyf/ddnn'. This indicates a downloader functionality, likely to fetch and execute a secondary payload.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `056ddde6506e4debda32cb55c463ac14b36f8e9e25cb7e4e58aad6e29503e2c4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	48006 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).

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