Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 19d1af88ee5914f0…

MALICIOUS

Office (OOXML) / .XLSM

719.0 KB Created: 2023-01-22 11:25:16 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-01-23
MD5: 9a5a10fecf9f31709e8fd158b1a76748 SHA-1: e84249c83e3913c7d258afc4b627c7dbfc8d16d5 SHA-256: 19d1af88ee5914f0911d5de8e0af6aeafaeac47206b1a0a17a54d3008e63d331
402 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro executes a PowerShell command that downloads a file from http://3.65.2.139/read/Ltrwmpfgvbk.exe and saves it to the temporary directory as an executable. This executable is then launched, indicating the macro's primary purpose is to act as a downloader for a second-stage payload. The use of WScript.Shell and CreateObject further supports the execution of external commands.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://3.65.2.139/read/Ltrwmpfgvbk.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c2fd78dfb1e32677d639448cf71a9469dba65036b783a404e29fe548517f5be0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1244 bytes
vbaProject_00.bin
dc6a5f1b78118df4b82ab773111fd34730cc61e801389a47a7cdd450aa877e6e		 vba-project OOXML VBA project: xl/vbaProject.bin 5120 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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