Primer paso de la investigacion. Se aportan el .apk, las carpetas con el apk extraido y el apk descompilado. El archivo API_DOCUMENTATION.md es un archivo donde se anotaran los descubrimientos del funcionamiento de la API, y los .py son scripts para probar la funcionalidad de la API con los métodos que vayamos encontrando. Finalmente, los archivos .js son scripts de Frida para extraer informacion de la APP durante la ejecucion.

apk_decompiled/sources/e3/AbstractC0327m.java

@@ -0,0 +1,110 @@
+package e3;
+
+import java.util.GregorianCalendar;
+import java.util.Locale;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import kotlin.jvm.internal.Intrinsics;
+import kotlin.text.StringsKt__StringsKt;
+
+/* renamed from: e3.m, reason: case insensitive filesystem */
+/* loaded from: classes3.dex */
+public abstract class AbstractC0327m {
+    public static int a(String str, int i, int i4, boolean z3) {
+        while (i < i4) {
+            char charAt = str.charAt(i);
+            if (((charAt < ' ' && charAt != '\t') || charAt >= 127 || ('0' <= charAt && charAt < ':') || (('a' <= charAt && charAt < '{') || (('A' <= charAt && charAt < '[') || charAt == ':'))) == (!z3)) {
+                return i;
+            }
+            i++;
+        }
+        return i4;
+    }
+
+    public static long b(int i, String str) {
+        int indexOf$default;
+        int a2 = a(str, 0, i, false);
+        Matcher matcher = C0328n.f6379m.matcher(str);
+        int i4 = -1;
+        int i5 = -1;
+        int i6 = -1;
+        int i7 = -1;
+        int i8 = -1;
+        int i9 = -1;
+        while (a2 < i) {
+            int a4 = a(str, a2 + 1, i, true);
+            matcher.region(a2, a4);
+            if (i5 == -1 && matcher.usePattern(C0328n.f6379m).matches()) {
+                String group = matcher.group(1);
+                Intrinsics.checkNotNullExpressionValue(group, "matcher.group(1)");
+                i5 = Integer.parseInt(group);
+                String group2 = matcher.group(2);
+                Intrinsics.checkNotNullExpressionValue(group2, "matcher.group(2)");
+                i8 = Integer.parseInt(group2);
+                String group3 = matcher.group(3);
+                Intrinsics.checkNotNullExpressionValue(group3, "matcher.group(3)");
+                i9 = Integer.parseInt(group3);
+            } else if (i6 == -1 && matcher.usePattern(C0328n.f6378l).matches()) {
+                String group4 = matcher.group(1);
+                Intrinsics.checkNotNullExpressionValue(group4, "matcher.group(1)");
+                i6 = Integer.parseInt(group4);
+            } else {
+                if (i7 == -1) {
+                    Pattern pattern = C0328n.f6377k;
+                    if (matcher.usePattern(pattern).matches()) {
+                        String group5 = matcher.group(1);
+                        Intrinsics.checkNotNullExpressionValue(group5, "matcher.group(1)");
+                        Locale US = Locale.US;
+                        Intrinsics.checkNotNullExpressionValue(US, "US");
+                        String lowerCase = group5.toLowerCase(US);
+                        Intrinsics.checkNotNullExpressionValue(lowerCase, "this as java.lang.String).toLowerCase(locale)");
+                        String pattern2 = pattern.pattern();
+                        Intrinsics.checkNotNullExpressionValue(pattern2, "MONTH_PATTERN.pattern()");
+                        indexOf$default = StringsKt__StringsKt.indexOf$default((CharSequence) pattern2, lowerCase, 0, false, 6, (Object) null);
+                        i7 = indexOf$default / 4;
+                    }
+                }
+                if (i4 == -1 && matcher.usePattern(C0328n.f6376j).matches()) {
+                    String group6 = matcher.group(1);
+                    Intrinsics.checkNotNullExpressionValue(group6, "matcher.group(1)");
+                    i4 = Integer.parseInt(group6);
+                }
+            }
+            a2 = a(str, a4 + 1, i, false);
+        }
+        if (70 <= i4 && i4 < 100) {
+            i4 += 1900;
+        }
+        if (i4 >= 0 && i4 < 70) {
+            i4 += 2000;
+        }
+        if (i4 < 1601) {
+            throw new IllegalArgumentException("Failed requirement.");
+        }
+        if (i7 == -1) {
+            throw new IllegalArgumentException("Failed requirement.");
+        }
+        if (1 > i6 || i6 >= 32) {
+            throw new IllegalArgumentException("Failed requirement.");
+        }
+        if (i5 < 0 || i5 >= 24) {
+            throw new IllegalArgumentException("Failed requirement.");
+        }
+        if (i8 < 0 || i8 >= 60) {
+            throw new IllegalArgumentException("Failed requirement.");
+        }
+        if (i9 < 0 || i9 >= 60) {
+            throw new IllegalArgumentException("Failed requirement.");
+        }
+        GregorianCalendar gregorianCalendar = new GregorianCalendar(f3.c.f6473e);
+        gregorianCalendar.setLenient(false);
+        gregorianCalendar.set(1, i4);
+        gregorianCalendar.set(2, i7 - 1);
+        gregorianCalendar.set(5, i6);
+        gregorianCalendar.set(11, i5);
+        gregorianCalendar.set(12, i8);
+        gregorianCalendar.set(13, i9);
+        gregorianCalendar.set(14, 0);
+        return gregorianCalendar.getTimeInMillis();
+    }
+}