Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 8a8661ce2c83142a…

MALICIOUS

Office (OLE) / .XLS

431.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 7418d8a491f32ca4a2a7d998a0b8c883 SHA-1: adcc61c053141beb0a1ce2ad8f7d7088e17d4da4 SHA-256: 8a8661ce2c83142a9e67fb753c518009e668ccb722be34853706425eadfc66be
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command and Shell

The Workbook_Open macro in the VBA script executes a Shell() command, indicating it's designed to run external code. The script reconstructs a URL from concatenated strings: "http://xxx00;tquui.hojmsvi.tk/npd/etgiwclw{tehgwtewt0wkihkyghyggh{etgiwclw{tehgwtewt0npd/hojmsvi.tk/xxx00;tquui". This URL is likely used to download and execute a second-stage payload. The script also constructs a path in the AppData directory: "AppData\\\\ yf/dsdd", which is likely where the downloaded payload will be saved.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3df45ae9309734c80c1a565678e36afd98e732e3def0706567c0a0a219d89339		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 45881 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 14 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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