Office (OLE) / .XLS malware analysis — malicious · 8f7e3471c1bb2b26

MALICIOUS

Office (OLE) / .XLS

32.0 KB Created: 2022-04-13 09:54:48 Authoring application: Microsoft Excel First seen: 2022-04-14

MD5: bdfca142fc1408ab2028019775a95a8a SHA-1: 5570baa3053ae3903af1caa09987c7cf248e5264 SHA-256: 8f7e3471c1bb2b264d1b8f298e7b7648dac84ffd8fb2125f3b2566353128e127

248 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer T1204.002 Malicious File

The Workbook_Open macro is triggered upon opening the spreadsheet. It uses CreateObject to instantiate an XMLHTTP object and download a file from the hardcoded IP address 'http://168.100.8.42/micro.exe'. The downloaded file is saved to the user's AppData directory as 'slyk.exe'. Finally, the Shell() function is called to execute the downloaded payload. The obfuscated strings are reconstructed to reveal the download URL and the path to the saved executable.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
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.

Filename	Kind	Source	Size
`macros.bas` `0eea7096f1ba620394203640c061affd20c20dc271dbb3959e28b321f701c41c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1688 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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