Suricata

On a scratch Windows 2016 VM in Google Cloud, I installed https://nmap.org/npcap/dist/npcap-1.00.exe and then https://www.openinfosecfoundation.org/download/windows/Suricata-6.0.0-beta1-1-64bit.msi. I'm testing using the pcap at https://archive.wrccdc.org/pcaps/2018/wrccdc.2018-03-23.010014000000000.pcap.gz after uncompressing it.

To test, I invoke Suricata like this:

"\Program Files\Suricata\suricata.exe" -r wrccdc.pcap

I've found that when my system timezone is set to default UTC or timezones that are UTC+xx:xx, the timestamp of the top event in eve.json is 2018-03-23T19:58:22.647908+0000. If I paste that into the ISO8601 box at https://www.timestamp-converter.com/, it translates to:

Date (UTC) Mar 23, 2018, 8:58:22 PM

But when the system timezone is set to timezones that are UTC-xx:xx (such as U.S. Pacific, Eastern, etc.), the timestamp of the top event in eve.json is 2018-03-23T12:58:22.647908-0900. Pasted into that tool, it translates to:

Date (UTC) Mar 23, 2018, 10:58:22 PM

For what it's worth, I first tried to repro the problem with
Suricata v5.0.3, but then I ran into the bug discussed at https://forum.suricata.io/t/eve-json-windows-timestamp-field-has-eastern-daylight-time-appended-to-timestamp/197 which led me to see to the change at https://github.com/OISF/suricata/pull/4976/commits/bbdc11842d324005567bac5eafdea5fd0fc62688, which is why I'd ended up testing with Suricata v6. Since that code happens to relate to timezones specifically on Windows I can't help but wonder if it's somehow related, but I'm not enough to a C developer to see on my own if there's a bug in there, so I'm pointing it out just in case it helps someone who sees this issue that better knows the code.

Here's the output of "suricata.exe --build-info" on that system:

---
26/11/2020 -- 09:43:23 - <Info> - Running as service: no
This is Suricata version 6.0.0-beta1 RELEASE
Features: PCAP_SET_BUFF HAVE_PACKET_FANOUT HAVE_HTP_URI_NORMALIZE_HOOK PCRE_JIT HAVE_NSS HAVE_LUA HAVE_LIBJANSSON TLS TLS_C11 RUST
SIMD support: none
Atomic intrinsics: 1 2 4 8 byte(s)
64-bits, Little-endian architecture
GCC version 10.2.0, C version 201112
compiled with -fstack-protector
compiled with _FORTIFY_SOURCE=2
L1 cache line size (CLS)=64
thread local storage method: _Thread_local
compiled with LibHTP v0.5.33, linked against LibHTP v0.5.33

Suricata Configuration:
AF_PACKET support: no
eBPF support: no
XDP support: no
PF_RING support: no
NFQueue support: no
NFLOG support: no
IPFW support: no
Netmap support: no
DAG enabled: no
Napatech enabled: no
WinDivert enabled: yes

Unix socket enabled:                     no
  Detection enabled:                       yes

Libmagic support:                        no
  libnss support:                          yes
  libnspr support:                         yes
  libjansson support:                      yes
  hiredis support:                         no
  hiredis async with libevent:             no
  Prelude support:                         no
  PCRE jit:                                yes
  LUA support:                             yes
  libluajit:                               no
  GeoIP2 support:                          yes
  Non-bundled htp:                         no
  Old barnyard2 support:
  Hyperscan support:                       no
  Libnet support:                          no
  liblz4 support:                          yes

Rust support:                            yes
  Rust strict mode:                        no
  Rust compiler path:                      /mingw64/bin/rustc
  Rust compiler version:                   rustc 1.43.0
  Cargo path:                              /mingw64/bin/cargo
  Cargo version:                           cargo 1.43.0
  Cargo vendor:                            yes

Python support:                          yes
  Python path:                             /mingw64/bin/python3
  Python distutils                         yes
  Python yaml                              yes
  Install suricatactl:                     yes
  Install suricatasc:                      yes
  Install suricata-update:                 yes

Profiling enabled:                       no
  Profiling locks enabled:                 no

Plugin support (experimental):           no

Development settings:
Coccinelle / spatch: no
Unit tests enabled: no
Debug output enabled: no
Debug validation enabled: no

Generic build parameters:
Installation prefix: /mingw64
Configuration directory: C:\Program Files\Suricata\
Log directory: C:\Program Files\Suricata\log

--prefix                                 /mingw64
  --sysconfdir                             /mingw64/etc
  --localstatedir                          /mingw64/var
  --datarootdir                            /mingw64/share

Host:                                    x86_64-w64-mingw32
  Compiler:                                gcc (exec name) / g++ (real)
  GCC Protect enabled:                     yes
  GCC march native enabled:                no
  GCC Profile enabled:                     no
  Position Independent Executable enabled: no
  CFLAGS                                   -g -O2 -DOS_WIN32 -std=c11 -DNTDDI_VERSION=NTDDI_VISTA -D_WIN32_WINNT=_WIN32_WINNT_VISTA -I${srcdir}/../rust/gen -I${srcdir}/../rust/dist
  PCAP_CFLAGS
  SECCFLAGS                                -fstack-protector -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security