Suspicious
Unsigned installer showing process injection, credential dumping and direct-IP C2 despite only one low-trust detection.
2e4c7957b523011731…0b6efc1644The verdict, reasoned out.
Not a rules engine. The MT AI Engine reads every signal we collected, weighs them against history, and commits to an answer.
The engine profile is a textbook low-trust-only false-positive pattern, yet the sandbox captured genuine offensive techniques and direct-IP C2 that are rarely seen in legitimate commodity software. Similar imphash files have received both safe and suspicious verdicts, and the file remains unsigned with no trusted publisher history. The combination of high-severity heuristics and behavioural red flags outweighs the clean tier-1 majority, placing the sample in the suspicious band.
Each signal cites a concrete token from the evidence the arbiter saw — engine name, MITRE technique, signer string, or an exact count.
engines: 1/69 malicious (APEX low_trust only), 17 tier-1 clean, onlyLowTrustFlagging=true
behaviour.offensiveTechniques: T1055, T1003, T1485, T1543.003 and direct-IP C2 (20 IPs, 0 domains)
prevalence.classification=common_old (2210 submitters), filenameAnalysis.hasInstallerHint=true, unsigned
similarHashes[1].verdict=safe (matchKind=imphash, reasonCode=ai:prevalent_commodity_software)
triggeredHeuristics: MalwareTips.Synth.ProcessInjection (high), DirectIpC2 (medium)
- 17 tier-1 engines clean
- Common_old prevalence (2210 submitters)
- No malicious dropped children
- No known-malicious contacted hosts
- Unsigned executable
- Process injection (T1055) observed
- Credential dumping (T1003) mapped
- Direct-IP C2 to 20 addresses, zero domains
- Data destruction technique (T1485)
Treat as suspicious; avoid execution until additional verification or a signed version is obtained.
1 contradiction resolved by the scoring engine
What this file did when executed
This file was detonated in 1 sandbox and its runtime behaviour was observed.
Adversary techniques mapped to the MITRE ATT&CK framework.
- 13.107.246.38
- 68.183.112.81
- 13.107.6.158
- 192.0.77.48
- 142.250.152.94
- 173.194.194.132
- 74.125.69.149
- 142.250.152.132
- 192.178.129.154
- 104.18.26.193
- http://crt.sectigo.com/SectigoPublicServerAuthenticationCAOVE36.crt
- C:\Users\<USER>\AppData\Local\Temp\is-TNV4E.tmp\file.tmp
- C:\Users\<USER>\AppData\Local\Temp\is-IVDL0.tmp\_isetup\_setup64.tmp
- C:\Users\<USER>\AppData\Local\Temp\is-IVDL0.tmp\_isetup\_iscrypt.dll
- C:\Program Files\Classic Paint\mspaint1.exe
- C:\Program Files\Classic Paint\unins000.dat
- C:\Program Files\Classic Paint\is-L5SHT.tmp
- C:\Program Files\Classic Paint\is-BICEN.tmp
- C:\Program Files\Classic Paint\mspaint1.exe
- C:\Program Files\Classic Paint\is-A1URV.tmp
- C:\Program Files\Classic Paint\en-US\is-VAHGH.tmp
- cversions.3.m
- Local\SessionImmersiveColorMutex
- Global\WIATRACE_MUTEX
- Global\OneSettingQueryMutex+compat+encapsulation
- Local\RstrMgr3887CAB8-533F-4C85-B0DC-3E5639F8D511
Files this sample writes at runtime
This file drops 10 children at runtime. None are currently flagged malicious in our cache.
- 5e1dc47c4f343b9b5d9a…cc8151Never scannednever seen before
- 602b43ef7df5db9797a5…58ac80Never scannednever seen before
- 8cb833520093a7dbbe7e…82377fNever scannednever seen before
- 9624fc5fec690c911467…e4ceb6Never scannednever seen before
- 388a796580234efc95f3…136f95Never scannednever seen before
- 589df6c42bf4019051cf…fc6944Never scannednever seen before
- 7b4d6761839cea9f5fc5…cf1849Never scannednever seen before
- 2f6294f9aa09f59a574b…a0f8fcNever scannednever seen before
- 2993cf6d89ef1ab63946…b1beefNever scannednever seen before
- 5f847d2e00d0eb9b8690…a893e5Never scannednever seen before
YARA + heuristic rules that fired
A researcher-curated or high-severity heuristic rule matched this sample. These rules target specific malware families and are near-definitive.
MITRE T1055 (Process Injection) observed — CreateRemoteThread / APC / reflective-DLL injection. The payload is being smuggled into a legitimate process to bypass AV hooks.
EvidenceC:\Windows\Explorer.EXEMITRE T1003 (OS Credential Dumping) mapped by at least one sandbox run.
Sample contacted 20 external IP address(es) and zero domains. Benign software virtually always uses DNS; no-DNS direct-IP C2 is a strong malware indicator because it bypasses reputation systems and dodges domain-based blocklists.
Evidence13.107.246.38 · 68.183.112.81 · 13.107.6.158
1 detection across 73 engines
Section entropy & packers
Section-level entropy and packer detection from the PE header. Nothing suspicious here — entropy is within the normal range for unpacked code.
How often this file shows up in the wild
Widely seen in the wild for a long time. High prior this is legitimate; isolated detections on common-old files are usually false positives.
Forensic fingerprint
- File name
- ClassicPaint-1.1-setup.exe
- Size
- 4.58 MB
- MIME type
- (unknown)
- Detected type
- Win32 EXE
- SHA-256
- 2e4c7957b5230117313dc1aad4c5a71777025ec5476b022a591f930b6efc1644
- MD5
- a71fe518803220831fd9291032b70fed
- SHA-1
- c6340ecd5d566c7372b4f4e4dd709e0b3ae5c011
- PE imphash
- e569e6f445d32ba23766ad67d1e3787f
- First seen (VT)
- 12/8/2022, 7:51:50 AM
- Last analysis (VT)
- 7/9/2026, 2:30:21 AM
- First scan (MalwareTips)
- 7/9/2026, 5:17:12 AM
- Last scan (MalwareTips)
- 7/9/2026, 5:17:12 AM
Reviews & malware reports(0)
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