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

Static analysis result for SHA-256 e98de0e6a0109c44…

MALICIOUS

Office (OLE) / .XLS

467.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: bdcf787f4f3750df332469b3d78a9fb7 SHA-1: 6f26eb6ced51e312382bcdee4779aa5d6ba1356a SHA-256: e98de0e6a0109c44236912b3b69ae0fbf973e63805256ef061ea56235d4458b7
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample contains a Workbook_Open VBA macro that utilizes WScript.Shell and CreateObject to download and execute a second-stage payload. The script reconstructs a URL from concatenated strings: "http://xxx00.tquui.npd/hojmsvi.tk/etgiwclw{tehgwtewt0npd/dklopjbgnkhoygoh0wkihkyghyggh". It also constructs a suspicious file path in the AppData directory: "AppData\fyf/dsdd". The use of Shell() and WScript.Shell indicates an intent to execute arbitrary code, likely downloading further malicious content.

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
d9f36b48a112ae94d273ce011923b2b8cd2cf6330e3b02f52663ee7acbebbae5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 48287 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 21 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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