Sigma medium test sigma
Suspicious Non-Browser Network Communication With Telegram API
Detects an a non-browser process interacting with the Telegram API which could indicate use of a covert C2
Detection Logic
{
"selection": {
"DestinationHostname
| contains": "api.telegram.org"
},
"filter_main_brave": {
"Image
| endswith": "\\brave.exe"
},
"filter_main_chrome": {
"Image": [
"C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe",
"C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe"
]
},
"filter_main_firefox": {
"Image": [
"C:\\Program Files\\Mozilla Firefox\\firefox.exe",
"C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe"
]
},
"filter_main_ie": {
"Image": [
"C:\\Program Files (x86)\\Internet Explorer\\iexplore.exe",
"C:\\Program Files\\Internet Explorer\\iexplore.exe"
]
},
"filter_main_maxthon": {
"Image
| endswith": "\\maxthon.exe"
},
"filter_main_edge_1": [
{
"Image
| startswith": "C:\\Program Files (x86)\\Microsoft\\EdgeWebView\\Application\\"
},
{
"Image
| endswith": "\\WindowsApps\\MicrosoftEdge.exe"
},
{
"Image": [
"C:\\Program Files (x86)\\Microsoft\\Edge\\Application\\msedge.exe",
"C:\\Program Files\\Microsoft\\Edge\\Application\\msedge.exe"
]
}
],
"filter_main_edge_2": {
"Image
| startswith": [
"C:\\Program Files (x86)\\Microsoft\\EdgeCore\\",
"C:\\Program Files\\Microsoft\\EdgeCore\\"
],
"Image
| endswith": [
"\\msedge.exe",
"\\msedgewebview2.exe"
]
},
"filter_main_opera": {
"Image
| endswith": "\\opera.exe"
},
"filter_main_safari": {
"Image
| endswith": "\\safari.exe"
},
"filter_main_seamonkey": {
"Image
| endswith": "\\seamonkey.exe"
},
"filter_main_vivaldi": {
"Image
| endswith": "\\vivaldi.exe"
},
"filter_main_whale": {
"Image
| endswith": "\\whale.exe"
},
"condition": "selection and not 1 of filter_main_*"
} False Positives
- ⚠ Legitimate applications communicating with the Telegram API e.g. web browsers not in the exclusion list, app with an RSS etc.
Field Validations
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