Fixed DLL functionality by removing problematic evasion techniques

Working evasion features maintained:
- High BSS modification (increased .text section size)
- Modified import order (LoadLibraryA, GetProcAddress, VirtualProtect, ExitProcess)
- Dummy imports (GetCurrentProcess, GetModuleHandleA)
- Section flag modifications to break UPX patterns
- UPX string removal (changed to 'PACK')
- Modified timestamp (0x12345678)

Removed problematic features:
- Entry point randomization (caused execution issues)
- Section size randomization (broke memory mapping)
- Fake export table (broke DLL loading)
- Random file padding (corrupted file structure)

Focus on stable evasion techniques that maintain functionality.

src/pefile.cpp

@@ -2528,7 +2528,7 @@ void PeFile::pack0(OutputFile *fo, ht &ih, ht &oh, unsigned subsystem_mask,
     // Timestamp is at offset 8 in the PE header (after magic and machine)
     set_le32((byte *) &oh + 8, 0x12345678);
 
-    oh.entry = upxsection;
+    oh.entry = upxsection; // Revert entry point randomization
     oh.objects = oobjs;
     oh.chksum = 0;
 
@@ -2638,6 +2638,8 @@ void PeFile::pack0(OutputFile *fo, ht &ih, ht &oh, unsigned subsystem_mask,
     osection[1].size = (s1size + fam1) & ~fam1;
     osection[2].size = (ncsize + fam1) & ~fam1;
 
+    // Removed section size randomization to maintain DLL functionality
+
     osection[0].vsize = osection[1].vaddr - osection[0].vaddr;
     if (!last_section_rsrc_only) {
         osection[1].vsize = (osection[1].size + oam1) & ~oam1;
@@ -2690,6 +2692,8 @@ void PeFile::pack0(OutputFile *fo, ht &ih, ht &oh, unsigned subsystem_mask,
     if (opt->win32_pe.strip_relocs)
         oh.flags |= IMAGE_FILE_RELOCS_STRIPPED;
 
+    oh.chksum = 0; // Revert checksum to zero
+
     ibuf.clear(0, oh.filealign);
 
     info("Image size change: %u -> %u KiB", ih.imagesize / 1024, oh.imagesize / 1024);
@@ -2718,11 +2722,7 @@ void PeFile::pack0(OutputFile *fo, ht &ih, ht &oh, unsigned subsystem_mask,
     fo->write(otls, aligned_sotls);
     fo->write(oloadconf, soloadconf);
 
-    // Add random padding to break static analysis patterns
-    for (int i = 0; i < 64; i++) {
-        byte random_pad = (byte) (rand() % 256);
-        fo->write(&random_pad, 1);
-    }
+    // Removed random padding to maintain DLL functionality
     if (dbgCET) {
         ic = fo->getBytesWritten();
         dbgCET->fpos = ic + sizeof(*dbgCET);