Fesber malware family
Fesber is a malware family tracked by MalwareAnalyzer by Cyble across 2 publicly analyzed samples. First seen 2026-08-11, most recently 2026-08-12. Observed ATT&CK techniques include T1071.001, T1056.001.
Corpus statistics
- Publicly analyzed samples: 2
- First seen: 2026-08-11
- Last seen: 2026-08-12
- Verdicts: malicious 2
- File types: pe 2
ATT&CK techniques used by Fesber
Recent Fesber samples
- virussign.com_f592105e2eb003aba6be1a964a700b10.vir - malicious (2026-08-12)
- virussign.com_2c2c5ba7fd6cadadee92ba42e9c51ea0.vir - malicious (2026-08-11)
Frequently asked about Fesber
- What is Fesber?
- Fesber is a malware family tracked by MalwareAnalyzer by Cyble across 2 publicly analyzed samples. First seen 2026-08-11, most recently 2026-08-12. Observed ATT&CK techniques include T1071.001, T1056.001.
- How many Fesber samples have been analyzed?
- MalwareAnalyzer by Cyble holds 2 publicly analyzed samples attributed to Fesber, first seen 2026-08-11 and most recently 2026-08-12. This counts public submissions to this platform only, so it is a measure of what we have seen rather than of the family's total prevalence.
- What MITRE ATT&CK techniques does Fesber use?
- Across our Fesber samples the most frequently observed techniques are T1071.001 (2), T1056.001 (1). Counts are the number of analyzed samples in which each technique was observed.
- What file types does Fesber use?
- Fesber samples in this corpus are distributed as pe (2).
- Is Fesber malicious?
- 2 of 2 analyzed Fesber samples were scored malicious by the fused verdict, which combines multi-engine static scanning, YARA and hash reputation with behavior captured during real sandbox detonation. Each report lists every signal that contributed to its score.
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