Office (OLE) / .XLSX malware analysis — malicious · b0116210570fb0c4

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 825a82054cabf463af31eab14bdbf8e3 SHA-1: 908e9fa54c79600e1b4b9a7c5137746d7bc728af SHA-256: b0116210570fb0c41293a62435ee8e14fbb0431a4f639375e1d26bdbd8c165cb

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File

The file contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a common delivery mechanism for malware. The script utilizes `CreateObject` to instantiate `Wscript.Shell` and proceeds to execute commands. It constructs the command `cuerlxmuerlxc /uerlxc suerlxtauerlxruerlxt uerlx/uerlxB uerlxc:uerlx uerlxduerlxl3uerlx2.uerlxexuerlxe uerlxc:uerlxneuihlows.duerlxluerlxl` which reconstructs to `c:\windows\system32\rundll32.exe c:\programdata\ughldskbhn.bat` and also attempts to execute `c:\programdata\yhjlswle.vbs`. The script also contains a long, obfuscated string that appears to be a list of URLs, likely for downloading secondary payloads. The presence of `SC_STR_WSCRIPT` heuristic and the ClamAV detection `Doc.Downloader.EmotetRed02220-9938909-0` further support 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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